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.

2, 4, 21, 330, 14610, 1820715, 608470460, 472778135611, 730304791620170

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Crossrefs

Sequence in context: A151803 A151804 A151805 * A151807 A151808 A151809

Adjacent sequences: A151803 A151804 A151805 * A151807 A151808 A151809

Keyword

nonn

Author

R. H. Hardin Jun 27 2009

Status

approved