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A216339 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order.

%I A216339 #6 Jul 22 2025 23:31:01
%S A216339 2,3,15,42,602,2440,61915,322776,12297978,77360796,4044784633,
%T A216339 29562890886,2004648242718,16604827619828,1404640885455993,
%U A216339 12954736337254696,1328741141974378250,13465808369740333664
%N A216339 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order.
%C A216339 Row 3 of A216338
%H A216339 R. H. Hardin, <a href="/A216339/b216339.txt">Table of n, a(n) for n = 1..41</a>
%e A216339 Some solutions for n=4
%e A216339 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
%e A216339 ..x..2..x..3....x..2..x..0....x..2..x..3....x..2..x..3....x..2..x..0
%e A216339 ..4..x..2..x....3..x..2..x....0..x..1..x....4..x..1..x....1..x..2..x
%K A216339 nonn
%O A216339 1,1
%A A216339 _R. H. Hardin_ Sep 04 2012