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%I #5 Mar 24 2016 08:33:40
%S 0,6,30,252,2298,28440,460494,10076742,298685550,12084696450,
%T 669841797084,51029625915420,5355630042866478,775782157115299926,
%U 155330231799053130042,43040564062668109646964
%N Number of nXnXn triangular 0..3 arrays with some element plus some adjacent element totalling 3+1, 3 or 3-1 exactly once.
%C Column 3 of A270850.
%H R. H. Hardin, <a href="/A270845/b270845.txt">Table of n, a(n) for n = 1..24</a>
%e Some solutions for n=4
%e .....0........2........0........3........2........2........2........3
%e ....1.0......3.3......0.0......3.3......3.3......3.3......3.2......3.3
%e ...0.0.0....3.3.2....1.0.0....3.3.2....3.3.2....2.3.2....2.3.3....2.3.3
%e ..1.0.1.1..2.2.3.3..0.0.1.1..2.3.2.3..2.3.3.2..3.2.3.3..3.3.3.3..3.3.2.2
%Y Cf. A270850.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 24 2016
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