A238519 Number of (n+1) X (2+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.

588, 9612, 345744, 10332060, 321566028, 9918146448, 306521859084, 9468890997276, 292536258921504, 9037550907769116, 279205473387683676, 8625745262429841312, 266482953705659809356, 8232698585182917536556

Offset

1,1

Comments

Column 2 of A238523.

Links

R. H. Hardin, Table of n, a(n) for n = 1..197

Formula

Empirical: a(n) = 21*a(n-1) +297*a(n-2) +360*a(n-3) -2756*a(n-4) -2972*a(n-5) -3851*a(n-6) +31899*a(n-7) -15873*a(n-8) -11376*a(n-9) +11160*a(n-10) -5184*a(n-11) -3456*a(n-12).

Example

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

Crossrefs

Cf. A238523.

Sequence in context: A211852 A178973 A259248 * A185884 A115487 A210894

Adjacent sequences: A238516 A238517 A238518 * A238520 A238521 A238522

Keyword

nonn

Author

R. H. Hardin, Feb 28 2014

Status

approved