A202748 Number of 7 X n 0..1 arrays with row sums equal and column sums unequal to adjacent columns.

2, 128, 2802, 183220, 8870150, 578826040, 37121438930, 2639009446600

Offset

1,1

Comments

Row 7 of A202742.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..1..0..0....0..1..0....0..1..1....0..1..0....0..0..1....0..1..1....1..0..0
..0..0..1....1..0..0....1..1..0....1..0..0....0..1..0....0..1..1....0..1..0
..0..1..0....1..0..0....0..1..1....0..1..0....0..1..0....0..1..1....0..0..1
..1..0..0....1..0..0....1..1..0....0..1..0....0..0..1....1..0..1....1..0..0
..0..0..1....0..0..1....0..1..1....0..0..1....0..0..1....1..1..0....0..1..0
..1..0..0....1..0..0....0..1..1....0..0..1....0..0..1....1..1..0....0..0..1
..0..0..1....0..0..1....0..1..1....0..1..0....1..0..0....1..1..0....0..1..0

Crossrefs

Cf. A202742.

Sequence in context: A226403 A106320 A106318 * A322308 A277757 A010367

Adjacent sequences: A202745 A202746 A202747 * A202749 A202750 A202751

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved