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A166217
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Number of 9X9X9 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n
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1
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1, 34, 665, 8865, 76249, 495985, 2661967, 11908924, 46316901, 161588843, 510043341, 1480441810, 4011008946, 10193915255, 24508598458, 56179164262, 123191992504, 259647495716, 528503830704, 1041183396446, 1991316075404
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