A276242 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-1), (-1,1) or (0,-2) and new values introduced in order 0..2.

1, 9, 85, 1447, 43662, 2069454, 219977330, 41132001645, 12485740560874, 8479969482488403, 9954378022508358771

Offset

1,2

Comments

Diagonal of A276248.

Links

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

Example

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

Crossrefs

Cf. A276248.

Sequence in context: A361283 A029711 A204465 * A015581 A152261 A028339

Adjacent sequences: A276239 A276240 A276241 * A276243 A276244 A276245

Keyword

nonn

Author

R. H. Hardin, Aug 25 2016

Status

approved