A181276 Number of nX(n+2) binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order.

8, 48, 766, 28924, 3409059, 1126220822

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Example

M and M*Mtranspose (mod 2) for 3X5
..0..0..0..1..0......1..1..1
..0..1..0..1..1......1..1..0
..1..1..0..1..0......1..0..1

Crossrefs

Superdiagonal 2 of A181274.

Sequence in context: A108214 A249514 A279739 * A010568 A080493 A355434

Adjacent sequences: A181273 A181274 A181275 * A181277 A181278 A181279

Keyword

nonn,more

Author

R. H. Hardin, Oct 10 2010

Status

approved