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A216079 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order.

%I A216079 #12 Dec 20 2015 17:11:55
%S A216079 1,2,5,52,203,4140,21147,678570,4213597,190899322,1382958545,
%T A216079 82864869804,682076806159,51724158235372,474869816156751,
%U A216079 44152005855084346,445958869294805289,49631246523618756274,545717047936059989389
%N A216079 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order.
%C A216079 Column 3 of A216084.
%C A216079 Appears to be identical to A000110 except for elements in the latter indexed by 3x + 2 for x >= 0. - _Chris Boyd_, Dec 20 2015
%H A216079 R. H. Hardin, <a href="/A216079/b216079.txt">Table of n, a(n) for n = 1..210</a>
%e A216079 Some solutions for n=4:
%e A216079 ..x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x
%e A216079 ..1..x..0....1..x..2....1..x..2....1..x..2....1..x..0....1..x..0....1..x..0
%e A216079 ..x..2..x....x..3..x....x..0..x....x..0..x....x..1..x....x..1..x....x..2..x
%e A216079 ..3..x..2....4..x..3....3..x..0....2..x..0....2..x..3....2..x..1....3..x..0
%K A216079 nonn
%O A216079 1,2
%A A216079 _R. H. Hardin_, Sep 01 2012