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A166215
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Number of 7X7X7 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n
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2
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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
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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