A184448 - OEIS

%I #7 Apr 23 2021 11:36:27

%S 63,600,3125,11766,53350,196974,660654

%N 1/36 the number of (n+2) X (n+2) 0..2 arrays with each 3 X 3 subblock containing two of one value, two of another, and five of the last.

%C Diagonal of A184457.

%e Some solutions with a(1,1)=0 for 4 X 4

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

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

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

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

%Y Cf. A184457.

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 14 2011