cp's OEIS Frontend

A229688 Number of defective 3-colorings of an n X n 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

%I A229688 #10 Apr 28 2021 01:25:33
%S A229688 0,3,626,80757,17724789,7551515197,6749642728251,13137498602431137,
%T A229688 56959853494513069323,558086310754870843057446,
%U A229688 12478933741531750768879884477,641265228914623466199892311965220
%N A229688 Number of defective 3-colorings of an n X n 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.
%C A229688 Diagonal of A229694.
%e A229688 Some solutions for n=3:
%e A229688   0 1 2   0 1 0   0 1 0   0 1 0   0 1 2   0 0 1   0 1 0
%e A229688   0 2 0   2 2 1   1 2 1   0 2 2   2 0 0   0 2 0   1 0 1
%e A229688   1 2 2   0 0 1   2 0 2   0 2 1   0 1 0   1 2 1   1 0 2
%K A229688 nonn,more
%O A229688 1,2
%A A229688 _R. H. Hardin_, Sep 27 2013