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A266467
Number of nX5 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
1
2, 7, 28, 137, 735, 4074, 22128, 113677, 544142, 2417707, 9991874, 38585111, 139969744, 479482160, 1558677189, 4829461991, 14318767180, 40765225229, 111787710303, 296081929163, 759290568963, 1889449601320, 4571408444209
OFFSET
1,1
COMMENTS
Column 5 of A266470.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..0..1..1....0..0..0..0..0....0..1..1..1..1
..0..0..0..0..1....0..1..1..0..0....0..0..1..1..1....1..0..0..0..0
..0..0..1..1..0....1..0..0..0..0....1..1..0..0..0....1..0..1..1..1
..1..1..0..0..0....1..0..0..0..0....1..1..1..1..1....1..1..0..0..0
CROSSREFS
Cf. A266470.
Sequence in context: A127783 A297195 A116539 * A370509 A141318 A276080
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2015
STATUS
approved