cp's OEIS Frontend

A229631 Number of defective 3-colorings of an n X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

%I A229631 #9 Apr 27 2021 21:31:50
%S A229631 0,6,244,10227,960325,170405645,61836040854,45634751291449,
%T A229631 69219300810586905,216612095709360988933,1408049695722118625807058,
%U A229631 18999842797533792961661827884
%N A229631 Number of defective 3-colorings of an n X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.
%C A229631 Diagonal of A229637.
%e A229631 Some solutions for n=3:
%e A229631   0 0 1   0 1 2   0 1 0   0 1 2   0 1 0   0 0 1   0 1 2
%e A229631   1 2 0   1 0 2   0 1 2   2 1 2   2 0 2   1 0 2   0 1 2
%e A229631   1 2 1   2 0 2   0 1 1   0 2 0   2 0 1   1 0 1   2 1 1
%Y A229631 Cf. A229637.
%K A229631 nonn
%O A229631 1,2
%A A229631 _R. H. Hardin_, Sep 27 2013