Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
1, 1, 1, 1, 1, 1, 9, 21, 35, 101, 287, 859, 3329, 15189, 75035, 399377, 2204921
1 seqfan posts
Fri May 21 09:59:46 CEST 2010 [seqfan] Re: Missing word in A107978