Number of free polyominoes (or square animals) with n cells.
1, 1, 1, 2, 5, 12, 35, 108, 369, 1285, 4655, 17073, 63600, 238591, 901971, 3426576
3 seqfan posts
Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java
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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