A151803 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 3 ones in any row or column.

2, 4, 21, 242, 4027, 87082, 2381388, 80218256, 3251373408, 155558286540

Offset

1,1

Links

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

Crossrefs

Sequence in context: A308763 A230690 A219745 * A151804 A151805 A151806

Adjacent sequences: A151800 A151801 A151802 * A151804 A151805 A151806

Keyword

nonn

Author

R. H. Hardin Jun 27 2009

Status

approved