A185563 1/4 the number of n X 5 0..3 arrays with no element equal both to the element above and to the element to its left.

256, 202500, 159749820, 126017211780, 99407416968000, 78416544382742160, 61858104930689319360, 48796145962555619907720, 38492350573406180494467240, 30364304873646611423433030660, 23952577505016018447231455650500

Offset

1,1

Comments

Column 5 of A185567.

Links

R. H. Hardin, Table of n, a(n) for n = 1..169

Formula

Empirical: a(n) = 829*a(n-1)-32339*a(n-2)+525706*a(n-3)-4547088*a(n-4)+22231638*a(n-5)-58780485*a(n-6)+68179725*a(n-7)-10661625*a(n-8).

Example

Some solutions for 3 X 5 with a(1,1)=0.
..0..0..0..2..3....0..0..0..3..0....0..0..2..2..1....0..0..0..0..2
..0..2..2..0..0....0..2..0..0..1....0..2..0..1..2....0..2..2..0..1
..0..0..3..2..0....0..0..1..3..1....0..0..2..1..2....0..2..3..3..1

Crossrefs

Cf. A185567.

Sequence in context: A185924 A013997 A118056 * A220302 A013833 A100636

Adjacent sequences: A185560 A185561 A185562 * A185564 A185565 A185566

Keyword

nonn

Author

R. H. Hardin, Jan 31 2011

Status

approved