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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
0
2, 3, 7, 67, 1282, 81476, 15970248
(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..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

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Last modified November 27 17:57 EST 2024. Contains 378168 sequences.
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