A274955 Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-1) (-2,0) or (0,-2) and new values introduced in order 0..2.

6, 72, 384, 2376, 14406, 87780, 536406, 3278016, 20027574, 122367012, 747675414, 4568374272, 27913169094, 170551986900, 1042088376006, 6367256060400, 38904520522614, 237710201714820, 1452431219269686, 8874488478680352

Offset

1,1

Comments

Column 4 of A274959.

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +4*a(n-3) +13*a(n-4) -74*a(n-5) -8*a(n-6) -4*a(n-8) +8*a(n-9) for n>11

Example

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

Crossrefs

Cf. A274959.

Sequence in context: A276244 A361571 A282817 * A177468 A052791 A334327

Adjacent sequences: A274952 A274953 A274954 * A274956 A274957 A274958

Keyword

nonn

Author

R. H. Hardin, Jul 12 2016

Status

approved