A202744 Number of 3Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns.

2, 8, 38, 140, 638, 3032, 14258, 70136, 350594, 1767452, 9029918, 46519544, 241210598, 1258499756, 6598909298, 34748813672, 183679125026, 974136322892, 5181534476414, 27634187724392, 147730324961126, 791463055043228

Offset: 1

Author

R. H. Hardin Dec 23 2011

Keywords

• nonn

Comments

Row 3 of A202742

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..50