A274801 Number of n X 6 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.

16, 164, 1572, 16328, 169328, 1774372, 18476064, 193292660, 2016460140, 21072173792, 219985654388, 2297904486000, 23995177354892, 250610794543168, 2617142836973944, 27332712382107996, 285444819027741180

Offset

1,1

Comments

Column 6 of A274803.

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +80*a(n-2) +140*a(n-3) -474*a(n-4) -998*a(n-5) -130*a(n-6) +781*a(n-7) +814*a(n-8) -79*a(n-9) -360*a(n-10) +54*a(n-11) +48*a(n-12) -52*a(n-13) +4*a(n-14) for n>15.

Example

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

Crossrefs

Cf. A274803.

Sequence in context: A275231 A138407 A094857 * A274747 A204031 A341084

Adjacent sequences: A274798 A274799 A274800 * A274802 A274803 A274804

Keyword

nonn

Author

R. H. Hardin, Jul 07 2016

Status

approved