A274744 Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2), (0,-1) or (-1,0) and new values introduced in order 0..2.

1, 3, 34, 813, 40242, 4190533, 920432562, 427529873959, 420708712370442, 878018029249193808, 3889681900917706414509, 36599212212994279601355491, 731787586726658710118188021426

Offset

1,2

Comments

Diagonal of A274749.

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Cf. A274749.

Sequence in context: A277391 A231850 A109521 * A222869 A069718 A077144

Adjacent sequences: A274741 A274742 A274743 * A274745 A274746 A274747

Keyword

nonn

Author

R. H. Hardin, Jul 04 2016

Status

approved