Number of fixed polyominoes with n cells.
1, 2, 6, 19, 63, 216, 760, 2725, 9910, 36446, 135268, 505861, 1903890, 7204874
2 seqfan posts
Tue Dec 30 04:14:31 CET 2008 [seqfan] Re: Two-fold symmetry sequence
Mon Dec 29 23:33:49 CET 2008 [seqfan] Re: Two-fold symmetry sequence
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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