#N B-heptomino
#C A very common methuselah with lifespan 148 that often arises with the cell at top left shifted one space to the left, which does not affect the subsequent evolution.
#C www.conwaylife.com/wiki/index.php?title=B-heptomino
x = 4, y = 3, rule = B3/S23
ob2o$3ob$bo!