A202743 Number of 2Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns

2, 2, 6, 22, 54, 102, 214, 582, 1590, 3814, 8662, 20934, 53942, 137190, 335574, 815942, 2032694, 5139942, 12902614, 32059846, 79807158, 200325350, 504502230, 1267146054, 3176193590, 7975495910, 20082938838, 50611676614, 127466481334

Offset

1,1

Comments

Row 2 of A202742

Links

R. H. Hardin, Table of n, a(n) for n = 1..168

Example

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

Crossrefs

Sequence in context: A225942 A004077 A271217 * A007985 A097090 A085403

Adjacent sequences: A202740 A202741 A202742 * A202744 A202745 A202746

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved