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A154057 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 6. 0

%I

%S 10,25,36,74,46,40,70,47,49,20,13,19,17,13,13,13,13,13,13,13,13,13,13,

%T 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,

%U 13,13,13,13,13,13,13,13,13,13,13

%N Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 6.

%C Value 13 starts at n=17 and continues through at least n=60.

%K nonn

%O 4,1

%A _R. H. Hardin_ Jan 04 2009

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Last modified January 23 20:39 EST 2021. Contains 340386 sequences. (Running on oeis4.)