A238520 Number of (n+1) X (3+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.

7056, 345744, 49787136, 5576504976, 659389472784, 77047385296896, 9026159037210000, 1056819881616572304, 123752228014558128384, 14490829645245700563600, 1696821126905800754981136

Offset

1,1

Comments

Column 3 of A238523.

Links

R. H. Hardin, Table of n, a(n) for n = 1..145

Formula

Empirical: a(n) = 102*a(n-1) +2016*a(n-2) -29659*a(n-3) +67326*a(n-4) +111132*a(n-5) -38416*a(n-6).

Example

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

Crossrefs

Cf. A238523.

Sequence in context: A234545 A250850 A071131 * A230975 A031582 A063057

Adjacent sequences: A238517 A238518 A238519 * A238521 A238522 A238523

Keyword

nonn

Author

R. H. Hardin, Feb 28 2014

Status

approved