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A151806
Number of n X n binary arrays with rows, considered as binary numbers, in strictly increasing order, and columns, considered as binary numbers, in nondecreasing order, and no more than 6 ones in any row or column.
0
2, 4, 21, 330, 14610, 1820715, 608470460, 472778135611, 730304791620170
OFFSET
1,1
CROSSREFS
Sequence in context: A151803 A151804 A151805 * A151807 A151808 A151809
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 27 2009
STATUS
approved