#N strange-x.rle
#O Jiaohu Yu, 29 December 2022
#C
#C A strange pattern that slowly grows a giant X. The center is p32,
#C but the full period goes through cycles where it is 2^n-2^m.
#C If you run it at a high step size, it makes a weird backwards
#C strobe effect.
#C
#C Reference:
#C https://conwaylife.com/forums/viewtopic.php?p=155378#p155378
x = 1, y = 3, rule = B2cin3aer4eijqr5i6-ak7c8/S01c2cn3k4kqtwy5ajky6ei78
o2$o!