A265474 Number of n X 2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.

1, 6, 36, 366, 4900, 55800, 970225, 11095448, 204833344, 1934752250, 44951208289, 364393934784, 10048532283364, 66162689956152, 2276670647380900, 12030558414011074, 521323759854121156, 2167321703073344910

Offset

1,2

Comments

Column 2 of A265480.

Links

R. H. Hardin, Table of n, a(n) for n = 1..202

Example

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

Crossrefs

Cf. A265480.

Sequence in context: A108733 A350525 A229530 * A277474 A137889 A071555

Adjacent sequences: A265471 A265472 A265473 * A265475 A265476 A265477

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved