A202745 Number of 4Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns

2, 10, 86, 838, 6870, 62398, 613950, 6018166, 59293518, 601267870, 6215708078, 64727555230, 679456522670, 7200537529326, 76879249259246, 825573117666246, 8913831877350462, 96733061472889806, 1054372579551732366

Offset

1,1

Comments

Row 4 of A202742

Links

Table of n, a(n) for n=1..19.

Example

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

Crossrefs

Sequence in context: A156466 A304403 A132397 * A364396 A367372 A372177

Adjacent sequences: A202742 A202743 A202744 * A202746 A202747 A202748

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved