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A152256
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Powers of 3 sequence:a(n)=(3^n - 1)*(3^n + 1)*(3^n + 1)/32.
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0
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0, 1, 25, 637, 16810, 450241, 12123475, 327035437, 8827268020, 238312027681, 6434206838125, 173721623357437, 4690466178937630, 126642427965100321, 3419344125259375975, 92322278513810982637, 2492701404059145489640
(list; graph; refs; listen; history; internal format)
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