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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 0
2, 2, 8, 63, 1463, 96228, 18531677 (list; graph; refs; listen; history; text; internal format)
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: A184347 A006673 A053978 * A224766 A003181 A009616

Adjacent sequences:  A181261 A181262 A181263 * A181265 A181266 A181267

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified July 29 08:28 EDT 2021. Contains 346340 sequences. (Running on oeis4.)