login
A355333
Triangle read by rows: T(n,k) is the number of n X n Boolean matrices with Schein rank k, 0 <= k <= n.
2
1, 1, 1, 1, 9, 6, 1, 49, 306, 156, 1, 225, 8550, 40656, 16104, 1, 961, 194850, 5771100, 21165720, 6421800
OFFSET
0,5
COMMENTS
Also, T(n,k) is the number of spanning subgraphs of the complete bipartite graph K_{n,n} that have bipartite dimension (or biclique covering number) k.
EXAMPLE
Triangle begins:
n\k | 0 1 2 3 4 5
----+--------------------------------------
0 | 1
1 | 1 1
2 | 1 9 6
3 | 1 49 306 156
4 | 1 225 8550 40656 16104
5 | 1 961 194850 5771100 21165720 6421800
CROSSREFS
Cf. A002416 (row sums), A064230, A286331, A354741, A355334.
Sequence in context: A286331 A363036 A354741 * A089479 A269444 A199431
KEYWORD
nonn,tabl,more
AUTHOR
STATUS
approved