A265468 Number of 3Xn 0..3+n-2 arrays with upper left zero and lower right 3+n-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.

3, 18, 550, 8812, 121819, 1630672, 25855219, 424583341, 6156035722, 81100545451, 1085691306969, 15448761192453, 220590548331594, 3019299007029137, 40274017206212359, 543481982379488630, 7470599265675871603

Offset

1,1

Comments

Row 3 of A265466.

Links

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

Example

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

Crossrefs

Cf. A265466.

Sequence in context: A132514 A188801 A304780 * A365292 A070953 A163261

Adjacent sequences: A265465 A265466 A265467 * A265469 A265470 A265471

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved