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A181280 Number of 4Xn binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly decreasing order 1
0, 0, 0, 58, 1629, 28924, 507052, 8211776, 133693904, 2140571200, 34361115072, 549587348992, 8798356254976, 140744002571264, 2252082614856704, 36030315649662976, 576487656686899200, 9223539637335310336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 4 of A181274

LINKS

R. H. Hardin, Table of n, a(n) for n=1..27

EXAMPLE

M and M*Mtranspose (mod 2) for 4X5

..0..1..0..1..1......1..0..0..0

..1..0..0..0..0......0..1..1..1

..1..1..0..0..1......0..1..1..0

..1..1..1..1..0......0..1..0..0

CROSSREFS

Sequence in context: A093258 A184599 A160347 * A017774 A035724 A017721

Adjacent sequences:  A181277 A181278 A181279 * A181281 A181282 A181283

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified August 11 06:25 EDT 2020. Contains 336422 sequences. (Running on oeis4.)