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

1,1

Comments

Row 3 of A202742

Links

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

Example

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

Crossrefs

Sequence in context: A020130 A159051 A053520 * A112738 A220806 A192529

Adjacent sequences: A202741 A202742 A202743 * A202745 A202746 A202747

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved