A269287 Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.

2592, 1363572, 544118148, 193446959076, 64538382287988, 20680187784811380, 6444304707617709156, 1967513283560471350788, 591384314583314302090068, 175574678705837994574453140, 51607712999525045688100012356

Offset: 1

Author

R. H. Hardin, Feb 21 2016

Keywords

• nonn

Comments

Column 6 of A269289.

Examples

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

Links

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

Crossrefs

Cf. A269289.

Formula

Empirical: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) [phone]*a(n-5) -92236816*a(n-6) for n>7