[seqfan] Re: Help with A028247 Number of T-frame polyominoes with n cells

mathar mathar at mpia-hd.mpg.de
Mon Feb 6 11:51:27 CET 2023

The T-frame polyominoes describe a subset of stages
of chomp https://en.wikipedia.org/wiki/Chomp
after two bites. It's only a subset because to leave
a T-polyomino the first bite must not remove an
entire set of rows/columns and the second bite must
not do that either and must not nimble at the corner
diagonally opposite to the first bite.

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