A275394 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, 84, 1011, 14884, 518049, 30551417, 3146508594, 552879942836, 167170218443304, 86562563964524453

Offset

1,2

Comments

Diagonal of A275401.

Links

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

Example

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

Crossrefs

Cf. A275401.

Sequence in context: A024118 A166902 A348316 * A236385 A335670 A196434

Adjacent sequences: A275391 A275392 A275393 * A275395 A275396 A275397

Keyword

nonn

Author

R. H. Hardin, Jul 26 2016

Status

approved