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

1,1

Comments

Column 7 of A269276.

Links

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

Formula

Empirical: a(n) = 1384*a(n-1) -566002*a(n-2) +61993580*a(n-3) -3083170217*a(n-4) +82564587476*a(n-5) -1288497445564*a(n-6) +12048887832352*a(n-7) -66380108132464*a(n-8) +198314583195456*a(n-9) -247475435747904*a(n-10) for n>11

Example

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

Crossrefs

Cf. A269276.

Sequence in context: A269213 A114771 A269096 * A013809 A013888 A280446

Adjacent sequences: A269272 A269273 A269274 * A269276 A269277 A269278

Keyword

nonn

Author

R. H. Hardin, Feb 21 2016

Status

approved