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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
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A057788 A267175 A266767 * A296574 A347686 A131700
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 09 2009
STATUS
approved