A266933 Number of nX6 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

2, 6, 19, 82, 429, 2577, 15850, 96503, 555060, 2977370, 14782970, 68041108, 291292442, 1165800099, 4383605127, 15564591521, 52423001756, 168200350788, 516045791503, 1519124991181

Offset

1,1

Comments

Column 6 of A266935.

Links

Table of n, a(n) for n=1..20.

Example

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

Crossrefs

Cf. A266935.

Sequence in context: A287897 A349401 A344317 * A291106 A363960 A079453

Adjacent sequences: A266930 A266931 A266932 * A266934 A266935 A266936

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved