A269275 Number of nX7 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

5832, 9211608, 9230973192, 7934992835112, 6310088238337128, 4786284820998999528, 3516906597130333936872, 2525822328725627338344168, 1783069155917082001205203176, 1241926797984458949166277812968

Offset: 1

Author

R. H. Hardin, Feb 21 2016

Keywords

• nonn

Comments

Column 7 of A269276.

Examples

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

Links

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

Crossrefs

Cf. A269276.

Formula

Empirical: a(n) = 1384*a(n-1) -566002*a(n-2) [phone]*a(n-3) -3083170217*a(n-4) [phone]*a(n-5) -1288497445564*a(n-6) [phone]*a(n-7) -66380108132464*a(n-8) [phone]*a(n-9) -247475435747904*a(n-10) for n>11