A267239 - OEIS

A267239

Number of n X n binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

2, 7, 42, 567, 20040, 2093467, 683027146, 723576702570, 2549735632656528, 30465608408449993885, 1250919952257037350168062, 178764247753852768666003981113, 89752660973687899647122735126286078

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OFFSET

1,1

COMMENTS

Diagonal of A267245.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

..0..0..0..1....0..0..0..1....0..0..1..1....0..0..0..1....0..0..0..1

..0..1..1..0....0..0..0..1....0..1..0..1....0..0..1..1....0..0..1..1

..1..0..1..0....0..0..1..1....1..1..0..0....0..1..0..1....1..1..1..0

..1..1..1..1....1..1..1..0....1..1..0..0....1..1..1..0....1..1..0..1

CROSSREFS

Cf. A267245.

Sequence in context: A091669 A108042 A152559 * A001174 A067975 A065298

Adjacent sequences: A267236 A267237 A267238 * A267240 A267241 A267242

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2016

STATUS

approved