A275125 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-2), (-1,0) or (-1,1) and new values introduced in order 0..2.

1, 4, 45, 568, 12423, 473185, 31446544, 3669759648, 753079344538, 270970785837211, 171664742070518870, 191385314222655170098

Offset

1,2

Comments

Diagonal of A275131.

Links

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

Example

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

Crossrefs

Cf. A275131.

Sequence in context: A073565 A039657 A114473 * A264123 A304645 A233313

Adjacent sequences: A275122 A275123 A275124 * A275126 A275127 A275128

Keyword

nonn

Author

R. H. Hardin, Jul 17 2016

Status

approved