A275221 - OEIS

%I #6 Apr 21 2020 12:44:26

%S 1,6,61,1302,64248,6534900,1368326231,608741311725,563051463762052

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

%C Diagonal of A275228.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A275228.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 20 2016