A181273 Number of n X n binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order

2, 3, 9, 58, 1991, 177193, 50841045, 40797077296

Offset

1,1

Comments

Diagonal of A181274

Links

Table of n, a(n) for n=1..8.

Example

M and M*Mtranspose (mod 2) for 4X4
..0..0..1..0......1..1..0..0
..0..1..1..0......1..0..0..0
..1..0..0..0......0..0..1..1
..1..0..0..1......0..0..1..0

Crossrefs

Sequence in context: A037389 A037425 A226967 * A270394 A120032 A126884

Adjacent sequences: A181270 A181271 A181272 * A181274 A181275 A181276

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved