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Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.
0

%I #3 Mar 31 2012 12:35:22

%S 35,159,734,695,675,1988,1941,881,2067,949,707,1003,551

%N Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.

%K nonn

%O 5,1

%A _R. H. Hardin_ Jan 04 2009