References to A056877

Number of polyominoes with n cells, symmetric about axis 2.
0, 1, 1, 1, 1, 2, 3, 4, 4, 8, 10, 15, 17, 30, 35, 60, 64, 117, 128, 236, 241, 459, 476, 937

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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