A265461 Number of nX3 0..n+3-2 arrays with upper left zero and lower right n+3-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.

1, 26, 550, 9808, 290140, 8526762, 226627855, 6429210362, 189020997503, 5485167198242, 160226445169831, 4738482482000394, 140498396836803614, 4175334634703864434, 124606393191706378406, 3729279022290970831400

Offset

1,2

Comments

Column 3 of A265466.

Links

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

Example

Some solutions for n=4
..0..1..0....0..2..3....0..2..1....0..1..0....0..2..1....0..2..4....0..2..4
..0..1..2....4..2..1....3..2..4....3..2..1....0..2..4....4..3..4....4..3..5
..2..0..1....1..3..2....1..3..4....3..2..4....1..3..2....4..3..4....2..3..2
..1..3..5....2..4..5....1..3..5....1..3..5....4..3..5....1..3..5....5..3..5

Crossrefs

Cf. A265466.

Sequence in context: A230247 A058461 A323492 * A257518 A283343 A160059

Adjacent sequences: A265458 A265459 A265460 * A265462 A265463 A265464

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved