A266939 - OEIS

A266939

Number of 6Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

7, 29, 92, 288, 871, 2577, 7185, 19529, 50216, 125786, 298869, 696808, 1546941, 3382516, 7085876, 14650326, 29153966, 57417292, 109223923, 205966389, 376634957, 683318087, 1206075185, 2114385852, 3615867548

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

OFFSET

1,1

COMMENTS

Row 6 of A266935.

LINKS

Table of n, a(n) for n=1..25.

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

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