A162103 Number of n X n binary arrays with rows and columns, considered as binary numbers, in strictly increasing order, and no more than 4 ones in any row or column

2, 3, 15, 234, 9109, 605528, 58808948, 7951647639, 1445101251806

Offset

1,1

Links

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

Crossrefs

Sequence in context: A180723 A162102 A087975 * A162104 A162105 A162106

Adjacent sequences: A162100 A162101 A162102 * A162104 A162105 A162106

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved