A166220 - OEIS

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A166220

Number of 12 X 12 X 12 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

1

1, 325, 52518, 4173156, 165533393, 4118194905, 73044448611, 958018305487, 9916013916442, 84913600697770

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Sequence in context: A298106 A266365 A340462 * A121000 A290949 A048909

Adjacent sequences: A166217 A166218 A166219 * A166221 A166222 A166223

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Oct 09 2009

STATUS

approved