A265460 Number of nX2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.

1, 3, 18, 232, 2764, 34471, 448920, 5975090, 80447900, 1094426175, 14999904834, 206767086652, 2863241645319, 39798521307247, 554919908488254, 7757840744425875, 108701456970018670, 1526103567822421597

Offset

1,2

Comments

Column 2 of A265466.

Links

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

Example

Some solutions for n=4
..0..2....0..2....0..2....0..1....0..1....0..2....0..2....0..1....0..1....0..2
..1..2....0..1....4..3....2..1....3..2....3..1....0..2....2..0....0..1....1..2
..0..2....0..2....2..4....3..2....0..1....3..1....3..2....2..1....2..3....0..1
..3..4....3..4....2..4....3..4....3..4....3..4....3..4....2..4....2..4....3..4

Crossrefs

Cf. A265466.

Sequence in context: A195766 A195767 A195763 * A137223 A159640 A038061

Adjacent sequences: A265457 A265458 A265459 * A265461 A265462 A265463

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved