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A166215 Number of 7X7X7 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n 2
1, 13, 90, 553, 2376, 8064, 25771, 70603, 172012, 405175, 875990, 1765534, 3484228, 6508702, 11604117, 20390870, 34490146, 56425254, 91343551, 143775379, 220716013, 336122564, 500966646, 732267501, 1063633842, 1518831488 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n=0..63

CROSSREFS

Sequence in context: A057788 A267175 A266767 * A296574 A347686 A131700

Adjacent sequences: A166212 A166213 A166214 * A166216 A166217 A166218

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 09 2009

STATUS

approved

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Last modified January 30 09:15 EST 2023. Contains 359944 sequences. (Running on oeis4.)