A269055 Number of 4Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

81, 666, 3258, 24192, 149358, 971844, 6053094, 37741920, 231943614, 1417576284, 8599619586, 51899214960, 311654917170, 1863739501308, 11103704855298, 65935768579488, 390381077316294, 2305171593612444, 13579182450069246

Offset

1,1

Comments

Row 4 of A269052.

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +23*a(n-2) -102*a(n-3) -288*a(n-4) +250*a(n-5) +787*a(n-6) -238*a(n-7) -741*a(n-8) +124*a(n-9) +196*a(n-10) -16*a(n-11) -16*a(n-12) for n>14

Example

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

Crossrefs

Cf. A269052.

Sequence in context: A236720 A187441 A187433 * A236876 A185366 A232026

Adjacent sequences: A269052 A269053 A269054 * A269056 A269057 A269058

Keyword

nonn

Author

R. H. Hardin, Feb 18 2016

Status

approved