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A216086 Number of horizontal and antidiagonal neighbor colorings of the odd squares of a 4Xn array with new integer colors introduced in row major order.

%I A216086 #10 Jul 22 2025 23:30:05
%S A216086 2,7,52,602,12840,322768,12297870,514264344,29562890980,1804957901332,
%T A216086 142953068558998,11807624690799832,1216988850964527370,
%U A216086 129339015912912689012,16679506383419809650408,2201178485290778203106968
%N A216086 Number of horizontal and antidiagonal neighbor colorings of the odd squares of a 4Xn array with new integer colors introduced in row major order.
%C A216086 Row 4 of A216084
%H A216086 R. H. Hardin, <a href="/A216086/b216086.txt">Table of n, a(n) for n = 1..19</a>
%e A216086 Some solutions for n=4
%e A216086 ..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1
%e A216086 ..1..x..2..x....1..x..2..x....2..x..3..x....2..x..0..x....2..x..0..x
%e A216086 ..x..0..x..2....x..3..x..4....x..0..x..4....x..3..x..4....x..1..x..2
%e A216086 ..1..x..0..x....5..x..6..x....2..x..0..x....5..x..6..x....3..x..0..x
%K A216086 nonn
%O A216086 1,1
%A A216086 _R. H. Hardin_ Sep 01 2012