Number of nXn binary arrays with rows and columns, considered as binary numbers, in strictly increasing order
2, 3, 15, 234, 10706, 1411450, 539124281, 607445721710, 2067567866431155
1 seqfan posts
Mon Jun 29 21:15:37 CEST 2009 [seqfan] Re: Binary arrays with both rows and cols sorted, symmetries?