A275259 - OEIS

%I #6 Apr 21 2020 12:45:10

%S 1,9,128,2564,126420,14005180,3224773976,1565667773372,

%T 1622686746762908,3362812964412060544

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

%C Diagonal of A275266.

%e Some solutions for n=4

%e ..0..1..0..1. .0..1..0..0. .0..1..0..2. .0..1..0..2. .0..1..2..1

%e ..0..1..0..1. .0..1..2..2. .0..2..0..1. .0..1..2..1. .2..1..2..0

%e ..2..1..0..1. .2..1..2..1. .0..2..0..1. .0..1..0..1. .2..1..0..0

%e ..0..1..0..1. .2..1..0..1. .0..1..0..1. .2..1..2..1. .2..1..2..1

%Y Cf. A275266.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 21 2016