A266940 - OEIS

A266940

Number of 7Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

8, 42, 182, 794, 3566, 15850, 68890, 288333, 1155281, 4410923, 16029008, 55677559, 184683538, 588011958

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 7 of A266935.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Cf. A266935.

Sequence in context: A119965 A229729 A055082 * A212337 A289031 A093381

Adjacent sequences: A266937 A266938 A266939 * A266941 A266942 A266943

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2016

STATUS

approved