A269216 Number of 3Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

0, 1152, 18048, 308544, 4744704, 70371048, 1012764384, 14272781904, 197924795136, 2710127012280, 36731155605600, 493646491209600, 6587572246924800, 87381895621488648, 1153101183028855008

Offset

1,2

Comments

Row 3 of A269214.

Links

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

Formula

Empirical: a(n) = 24*a(n-1) -130*a(n-2) -248*a(n-3) +935*a(n-4) +272*a(n-5) -1768*a(n-6) +960*a(n-7) -144*a(n-8)

Example

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

Crossrefs

Cf. A269214.

Sequence in context: A179689 A131527 A229590 * A339926 A170775 A350691

Adjacent sequences: A269213 A269214 A269215 * A269217 A269218 A269219

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved