A181264 Number of n X n binary matrices M with rows in strictly increasing order such that M^2 (mod 2) also has rows in strictly increasing order

2, 2, 8, 63, 1463, 96228, 18531677

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A006673 A354065 A053978 * A354118 A224766 A003181

Adjacent sequences: A181261 A181262 A181263 * A181265 A181266 A181267

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved