A267248 Number of 5Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

6, 63, 486, 3351, 20040, 107015, 516084, 2278687, 9303052, 35428544, 126753732, 428651446, 1377310514, 4223642819, 12409437728, 35050866249, 95459908872, 251341796912, 641282264972, 1588863292072

Offset

1,1

Comments

Row 5 of A267245.

Links

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

Example

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

Crossrefs

Cf. A267245.

Sequence in context: A296393 A123615 A245754 * A053535 A268220 A272495

Adjacent sequences: A267245 A267246 A267247 * A267249 A267250 A267251

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved