A239156 Number of (3+1)X(n+1) 0..3 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..3 introduced in row major order

7, 55, 868, 12159, 175471, 2519488, 36221263, 520615791, 7483320292, 107564015719, 1546111034695, 22223587182336, 319438814614615, 4591569914960743, 65998599449004004, 948654862324898319

Offset

1,1

Comments

Row 3 of A239155

Links

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

Formula

Empirical: a(n) = 14*a(n-1) +14*a(n-2) -124*a(n-3) -6*a(n-4) +90*a(n-5) -27*a(n-6)

Example

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

Crossrefs

Sequence in context: A180829 A227544 A094656 * A117993 A055056 A305282

Adjacent sequences: A239153 A239154 A239155 * A239157 A239158 A239159

Keyword

nonn

Author

R. H. Hardin, Mar 11 2014

Status

approved