List of one-glider seeds

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The following table displays all known 1G seeds -- constellations of stationary objects that metamorphose into a desired target object when a single glider collides with them on the correct lane.

Pattern name Bounding box Number of objects Population Earliest known
Spaceships
LWSS 15×9 3 14 before July 2006, Golly's Patterns/Life/Breeders/switch-engine-breeder-MR.rle
MWSS 8×8 3 12 August 2013?
HWSS 14×14 4 21 June 2013 (?)
loafer 46×45 14 84 February 2013 original version, March 2015 smaller version
3-engine Cordership 63×67 18 91 March 2015
2-engine Cordership 48×55 15 71 January 2018
58P5H1V1 1296×1352 ~800 4727 July 2020
Growing objects
Mitchell Riley's switch engine breeder, 2006? 221×173 80 330 Golly's Patterns/Life/Breeders/switch-engine-breeder-MR.rle
crab wickstretcher 70×96 42 262 August 2020 (not a clean seed, builds extra glider intended to react with a c/3 wick-burning fuse in a way that will cleanly destroy the crab with no output gliders and can be used to produce an elbow block at arbitrary distances; leaves some ash behind)
crab double wickstretcher 96×94 60 355 August 2020 (not a clean seed, builds extra gliders intended to react with a c/3 wick-burning fuse in a way that will cleanly destroy the crab with no output gliders and can be used to produce an elbow block at arbitrary distances, leaves some ash behind; the northwest wick can be burnt without destroying the southeast wick or the crab, leaving behind a secondary elbow block)
Gosper glider gun 45×31 9 51 https://www.conwaylife.com/forums/viewtopic.php?p=71963#p71963
space rake 99×96 59 294 July 2020
space backrake 113×108 51 263 August 2020
Stationary objects
star 275×275 193 772 August 2004, Golly's Patterns/Life/Syntheses/blockic-and-blockish-seeds.rle
eater2 variant 191×197 147 606 August 2004, Golly's Patterns/Life/Syntheses/blockic-and-blockish-seeds.rle
p256 oscillator 80×63 41 164 August 2004, Golly's Patterns/Life/Syntheses/blockic-and-blockish-seeds.rle (incomplete, 10 gliders)

References