Number of distinct n X n (0,1) matrices after double sorting: by row, by column, by row .. until reaching a fixed point.
1, 2, 7, 45, 650, 24520, 2625117, 836488618, 818230288201, 2513135860300849
3 seqfan posts
Mon Jun 29 21:15:37 CEST 2009 [seqfan] Re: Binary arrays with both rows and cols sorted, symmetries?