A229664 - OEIS

A229664

Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.

%I #10 Apr 28 2021 01:24:08

%S 0,4,1555,328160,78681904,29775277216,20240623720512,

%T 26289798524244224,67473235330524263424

%N Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.

%C Diagonal of A229672.

%e Some solutions for n=3:

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

%e 2 2 3 3 1 0 0 1 3 2 3 0 3 3 0 1 3 0 2 0 3

%e 1 3 2 2 0 1 3 0 2 0 1 0 0 2 2 3 1 3 3 1 2

%K nonn,more

%O 1,2

%A _R. H. Hardin_, Sep 27 2013