A274953 Number of n X n 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.

1, 9, 90, 2376, 126540, 14362920, 3403449396, 1709255996280, 1815331983698400, 4087173374510731764, 19501827096038985616536

Offset

1,2

Comments

Diagonal of A274959.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A274959.

Sequence in context: A218118 A160569 A157545 * A157558 A157584 A077334

Adjacent sequences: A274950 A274951 A274952 * A274954 A274955 A274956

Keyword

nonn

Author

R. H. Hardin, Jul 12 2016

Status

approved