A203604 Number of n X 2 0,1 arrays with adjacent row and column sums unequal.

2, 8, 20, 44, 116, 332, 900, 2268, 5716, 14892, 39268, 101820, 260532, 668300, 1727812, 4469404, 11506196, 29540332, 75933220, 195497084, 503093108, 1292802636, 3320226820, 8530094940, 21919963604, 56309625260, 144586811108

Offset

1,1

Comments

Column 2 of A203610.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for 4 X 4
..0..0....1..0....0..0....1..1....1..0....1..1....0..1....1..1....1..0....1..1
..1..0....1..1....1..0....0..0....0..0....0..0....0..0....1..0....1..1....1..0
..0..0....1..0....1..1....0..1....1..0....0..1....0..1....1..1....0..0....1..1
..1..1....1..1....0..0....1..1....0..0....0..0....1..1....1..0....1..0....1..0

Crossrefs

Cf. A203610.

Sequence in context: A131128 A165751 A296954 * A240940 A066857 A146168

Adjacent sequences: A203601 A203602 A203603 * A203605 A203606 A203607

Keyword

nonn,changed

Author

R. H. Hardin, Jan 03 2012

Status

approved