A266932 Number of nX5 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

2, 5, 14, 52, 210, 871, 3566, 13899, 50841, 173470, 553021, 1652621, 4652572, 12400392, 31443461, 76188169, 177120011, 396481264, 857322183, 1795814448, 3653191802, 7233526075, 13969016501, 26357103244, 48668165412, 88071764221

Offset

1,1

Comments

Column 5 of A266935.

Links

R. H. Hardin, Table of n, a(n) for n = 1..34

Example

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

Crossrefs

Cf. A266935.

Sequence in context: A306892 A115275 A000679 * A243787 A275825 A081439

Adjacent sequences: A266929 A266930 A266931 * A266933 A266934 A266935

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved