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A152256 a(n) = (3^n - 1)*(3^n + 1)*(3^n + 1)/32. 0
0, 1, 25, 637, 16810, 450241, 12123475, 327035437, 8827268020, 238312027681, 6434206838125, 173721623357437, 4690466178937630, 126642427965100321, 3419344125259375975, 92322278513810982637, 2492701404059145489640, 67302936867273104276161 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..17.

FORMULA

a(n)=(3^n - 1)*(3^n + 1)*(3^n + 1)/32.

MATHEMATICA

Clear[a, n];

a[n_] := (3^n - 1)*(3^n + 1)*(3^n + 1)/32

Table[a[n], {n, 0, 30}]

CROSSREFS

Sequence in context: A042202 A203341 A260048 * A153111 A097194 A180811

Adjacent sequences:  A152253 A152254 A152255 * A152257 A152258 A152259

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Dec 01 2008

STATUS

approved

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Last modified July 29 13:28 EDT 2021. Contains 346346 sequences. (Running on oeis4.)