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A216080 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an nX4 array with new integer colors introduced in row major order.

%I A216080 #6 Jul 22 2025 23:29:40
%S A216080 1,4,42,602,15144,433252,18378580,839621092,52183667212,3404551437592,
%T A216080 286529186194664,24947253698767632,2701657928740913416,
%U A216080 299900819552115769424,40316833236311531705440,5520994078882300886182032
%N A216080 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an nX4 array with new integer colors introduced in row major order.
%C A216080 Column 4 of A216084
%H A216080 R. H. Hardin, <a href="/A216080/b216080.txt">Table of n, a(n) for n = 1..78</a>
%e A216080 Some solutions for n=4
%e A216080 ..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1
%e A216080 ..2..x..3..x....2..x..3..x....2..x..3..x....1..x..2..x....2..x..3..x
%e A216080 ..x..1..x..2....x..4..x..5....x..4..x..1....x..3..x..1....x..1..x..0
%e A216080 ..3..x..0..x....6..x..0..x....5..x..3..x....0..x..4..x....4..x..3..x
%K A216080 nonn
%O A216080 1,2
%A A216080 _R. H. Hardin_ Sep 01 2012