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A216334 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.

%I A216334 #8 Jul 08 2024 17:09:55
%S A216334 1,5,42,726,15144,502658,18378580,950376664,52183667212,3788883495864,
%T A216334 286529186194664,27420871472654064,2701657928740913416,
%U A216334 326508788572113365896,40316833236311531705440,5965422648942609379676752,897057171450298448594594368,158723597386944654236759074832
%N A216334 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X 4 array with new integer colors introduced in row major order.
%H A216334 R. H. Hardin, <a href="/A216334/b216334.txt">Table of n, a(n) for n = 1..78</a>
%e A216334 Some solutions for n=4:
%e A216334 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
%e A216334 ..x..2..x..1....x..0..x..1....x..2..x..0....x..2..x..3....x..2..x..0
%e A216334 ..1..x..2..x....2..x..3..x....0..x..3..x....3..x..4..x....0..x..3..x
%e A216334 ..x..1..x..2....x..0..x..1....x..0..x..3....x..5..x..3....x..1..x..4
%Y A216334 Column 4 of A216338.
%K A216334 nonn
%O A216334 1,2
%A A216334 _R. H. Hardin_, Sep 04 2012