A151808 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 8 ones in any row or column.

2, 4, 21, 330, 14610, 1820715, 653629616, 696496706166, 2213581411047749, 19866756948798084481

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A151805 A151806 A151807 * A151809 A151801 A284920

Adjacent sequences: A151805 A151806 A151807 * A151809 A151810 A151811

Keyword

nonn

Author

R. H. Hardin Jun 27 2009

Status

approved