A202748 - OEIS

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A202748

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

0

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

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

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

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