A208395 Number of 4 X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

14, 1094, 79092, 5800644, 424785708, 31112194860, 2278687944204, 166893600277548, 12223468411103052, 895260103173464940, 65569822288888377996, 4802404999579303113900, 351733358040572021645772

Offset

1,1

Comments

Row 4 of A208392.

Links

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

Formula

Empirical: a(n) = 61*a(n-1) +868*a(n-2) +2200*a(n-3) -7744*a(n-4) -17728*a(n-5) +40704*a(n-6) -13824*a(n-7) for n>9.

Example

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

Crossrefs

Cf. A208392.

Sequence in context: A160011 A104226 A282272 * A132504 A178989 A232373

Adjacent sequences: A208392 A208393 A208394 * A208396 A208397 A208398

Keyword

nonn

Author

R. H. Hardin, Feb 25 2012

Status

approved