A181263 Number of n X n binary matrices M with rows in strictly increasing order such that M^2 (mod 2) has rows in strictly decreasing order

2, 3, 7, 67, 1282, 81476, 15970248

Offset

1,1

Links

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

Example

M and M^2 (mod 2) for 3X3
..0..1..0......1..1..0
..1..1..0......1..0..0
..1..1..1......0..1..1

Crossrefs

Sequence in context: A255357 A270002 A057736 * A130309 A090870 A088542

Adjacent sequences: A181260 A181261 A181262 * A181264 A181265 A181266

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved