cp's OEIS Frontend

A229602 Number of defective 3-colorings of an n X 4 0..2 array connected horizontally and vertically with exactly two mistakes, and colors introduced in row-major 0..2 order.

%I A229602 #9 Apr 27 2021 21:26:38
%S A229602 3,202,3040,35182,362100,3476928,31848813,281845934,2429033768,
%T A229602 20498682291,170050970491,1390738347774,11237781105036,89873465482971,
%U A229602 712350529942518,5602092417764388,43752038622648030,339600817518201684
%N A229602 Number of defective 3-colorings of an n X 4 0..2 array connected horizontally and vertically with exactly two mistakes, and colors introduced in row-major 0..2 order.
%C A229602 Column 4 of A229606.
%H A229602 R. H. Hardin, <a href="/A229602/b229602.txt">Table of n, a(n) for n = 1..210</a>
%F A229602 Empirical: a(n) = 27*a(n-1) - 288*a(n-2) + 1557*a(n-3) - 4644*a(n-4) + 8073*a(n-5) - 8343*a(n-6) + 5022*a(n-7) - 1620*a(n-8) + 216*a(n-9) for n > 11.
%e A229602 Some solutions for n=3:
%e A229602   0 1 0 2     0 1 2 1     0 1 2 0     0 1 2 1     0 1 0 1
%e A229602   1 2 1 1     1 1 0 2     1 2 0 1     0 2 1 0     2 2 1 0
%e A229602   2 0 1 0     2 0 2 0     2 0 0 2     1 1 0 2     1 0 0 2
%Y A229602 Cf. A229606.
%K A229602 nonn
%O A229602 1,1
%A A229602 _R. H. Hardin_, Sep 26 2013