A202747 Number of 6Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns

2, 44, 1074, 29680, 827502, 27842760, 967878370, 35772388788, 1349807335782, 52493731492612

Offset

1,1

Comments

Row 6 of A202742

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..1..0..1..0....1..1..0..0....0..1..1..0....1..1..0..0....0..1..0..1
..1..0..1..0....1..0..0..1....1..1..0..0....0..1..0..1....0..0..1..1
..0..1..1..0....1..0..1..0....1..1..0..0....1..0..1..0....0..1..1..0
..1..0..1..0....1..0..1..0....0..1..0..1....0..1..1..0....1..1..0..0
..1..1..0..0....0..0..1..1....1..0..0..1....0..1..0..1....1..0..0..1
..1..0..1..0....0..1..1..0....0..0..1..1....1..0..1..0....0..1..0..1

Crossrefs

Sequence in context: A203606 A009620 A001627 * A094397 A213067 A140795

Adjacent sequences: A202744 A202745 A202746 * A202748 A202749 A202750

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved