#N fractal-envelope.rle
#O Plasmath, 6 November 2023
#C
#C This pattern is presented in LifeHistory to highlight
#C an interesting fractal generated by this spaceship
#C generating replicator, composed of concentric diagonal
#C squares.
#C
#C Reference:
#C https://conwaylife.com/forums/viewtopic.php?p=170621#p170621
x = 4, y = 4, rule = B2n3acijr4cijt5r6i8/S2aek3ijnqr4ei5-ckqy6eHistory
.3A$A2.A$A2.A$3A!