A202738 Number of nX4 0..1 arrays with row sums equal and column sums unequal to adjacent columns.

2, 22, 140, 838, 5092, 29680, 183220, 1061814, 6630116, 39048472, 242647660, 1438692856, 8910239756, 53090781836, 327214611580, 1954347351734, 11998820896676, 71771002591048, 439163289580348, 2629051988484048

Offset: 1

Author

R. H. Hardin Dec 23 2011

Keywords

• nonn

Comments

Column 4 of A202742

Examples

			Some solutions for n=5
..0..1..1..0....1..0..1..0....0..1..0..1....1..1..0..0....1..1..0..0
..0..0..1..1....0..0..1..1....1..0..1..0....0..1..1..0....1..0..0..1
..0..1..0..1....1..0..1..0....0..1..1..0....0..1..1..0....1..0..0..1
..0..1..0..1....1..0..1..0....0..1..1..0....1..0..0..1....1..0..1..0
..1..0..0..1....0..1..0..1....0..0..1..1....1..1..0..0....0..1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..74