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Number of nXnXn triangular 0..5 arrays with some element plus some adjacent element totalling 5 exactly once.
0

%I #3 Mar 14 2016 09:16:11

%S 0,72,14976,7876728,12712991544,67475902622400,1217128601064427992,

%T 75996953900646817459320,16613624242885262049626796576

%N Number of nXnXn triangular 0..5 arrays with some element plus some adjacent element totalling 5 exactly once.

%C Column 5 of A270256.

%e Some solutions for n=3

%e ....1......5......4......3......2......3......0......1......5......1......1

%e ...0.2....5.4....4.4....0.4....3.5....5.4....4.0....5.0....0.1....2.1....0.1

%e ..1.3.5..5.1.5..0.5.2..2.3.4..1.5.5..3.0.2..4.5.1..4.3.4..1.2.0..1.2.3..1.5.2

%Y Cf. A270256.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 14 2016