A266938 Number of 5Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

6, 19, 44, 100, 210, 429, 816, 1534, 2727, 4753, 7931, 13044, 20676, 32360, 49327, 73959, 108612, 157751, 224746, 317514, 440564, 606496, 823905, 1110469, 1480403, 1957027, 2563177, 3335398, 4302564, 5520403, 7021711, 8888187, 11173884

Offset

1,1

Comments

Row 5 of A266935.

Links

R. H. Hardin, Table of n, a(n) for n = 1..57

Example

Some solutions for n=4
..0..1..1..1....0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..0
..1..0..1..1....0..0..0..0....1..1..1..0....0..0..1..1....0..0..0..0
..1..1..0..1....0..0..0..0....1..1..1..0....1..1..0..0....0..0..1..1
..1..1..1..0....0..0..0..1....1..1..1..0....1..1..0..1....1..1..0..1
..1..1..1..1....1..1..1..0....1..1..1..1....1..1..1..0....1..1..1..0

Crossrefs

Cf. A266935.

Sequence in context: A183763 A209403 A272707 * A362602 A299265 A005712

Adjacent sequences: A266935 A266936 A266937 * A266939 A266940 A266941

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved