A275497 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-1), (-2,0) or (-1,-1) and new values introduced in order 0..2.

1, 9, 80, 656, 4180, 68080, 1643372, 58423188, 3045734096, 235680645520, 26923774835716, 4558306996574952

Offset

1,2

Comments

Diagonal of A275504.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A275504.

Sequence in context: A293731 A254833 A342933 * A171314 A370039 A081108

Adjacent sequences: A275494 A275495 A275496 * A275498 A275499 A275500

Keyword

nonn

Author

R. H. Hardin, Jul 30 2016

Status

approved