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A216613 Number of horizontal, diagonal and antidiagonal neighbor colorings of the odd squares of a 3 X n array with new integer colors introduced in row major order.

%I A216613 #6 Dec 28 2023 19:35:15
%S A216613 1,2,2,15,41,716,2847,83440,426422,18171918,112072316,6423127757,
%T A216613 46054057965,3376465219485,27457462735926,2486327138729353,
%U A216613 22530435476364494,2454996141671330713,24463971326544703312
%N A216613 Number of horizontal, diagonal and antidiagonal neighbor colorings of the odd squares of a 3 X n array with new integer colors introduced in row major order.
%C A216613 Row 3 of A216612.
%H A216613 R. H. Hardin, <a href="/A216613/b216613.txt">Table of n, a(n) for n = 1..41</a>
%e A216613 Some solutions for n=4
%e A216613 ..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1
%e A216613 ..2..x..3..x....2..x..3..x....1..x..2..x....2..x..3..x....2..x..3..x
%e A216613 ..x..0..x..4....x..4..x..5....x..0..x..3....x..4..x..1....x..1..x..0
%Y A216613 Cf. A216612.
%K A216613 nonn
%O A216613 1,2
%A A216613 _R. H. Hardin_, Sep 10 2012