A181275 Number of nX(n+1) binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order.

4, 11, 79, 1629, 87873, 15691171, 7892201343

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Example

M and M*Mtranspose (mod 2) for 3X4
..0..0..0..1......1..0..0
..0..1..0..0......0..1..1
..0..1..1..0......0..1..0

Crossrefs

Superdiagonal 1 of A181274.

Sequence in context: A032110 A054234 A213328 * A000850 A004796 A320289

Adjacent sequences: A181272 A181273 A181274 * A181276 A181277 A181278

Keyword

nonn,more

Author

R. H. Hardin, Oct 10 2010

Status

approved