A162121 Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 4 ones in any row or column

2, 4, 25, 408, 15142, 1005975, 101107992, 14314188384, 2728248222006

Offset

1,1

Links

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

Crossrefs

Sequence in context: A119029 A291144 A162120 * A162122 A162123 A162124

Adjacent sequences: A162118 A162119 A162120 * A162122 A162123 A162124

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved