A269038 Number of 4Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 504, 2136, 18384, 115656, 785124, 4998648, 31834476, 198736752, 1231177296, 7552688064, 46020487500, 278641166280, 1678349335044, 10062618187272, 60089435895360, 357550261665528, 2120806295463156, 12543856834626072

Offset

1,2

Comments

Row 4 of A269035.

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..1..0..1. .2..2..2..1. .2..2..2..2. .1..0..0..2. .2..2..1..2
..2..1..2..1. .2..2..2..2. .1..2..2..1. .1..0..1..0. .2..2..2..2
..0..1..0..1. .2..1..2..1. .1..2..1..2. .0..0..1..0. .2..2..2..2
..0..0..2..1. .0..2..2..1. .1..2..1..2. .1..0..1..0. .2..2..1..1

Crossrefs

Cf. A269035.

Sequence in context: A335654 A226265 A277114 * A161005 A259953 A180164

Adjacent sequences: A269035 A269036 A269037 * A269039 A269040 A269041

Keyword

nonn

Author

R. H. Hardin, Feb 18 2016

Status

approved