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A109774 (3^(n-1) - 1) * (3^n - 1)/2. 0
0, 8, 104, 1040, 9680, 88088, 795704, 7170080, 64556960, 581091368, 5230058504, 47071235120, 423643241840, 3812795553848, 34315179116504, 308836669444160, 2779530197184320, 25015772291219528, 225141952170657704, 2026277574184965200 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A190786 A138430 A164760 * A001657 A106260 A112121

Adjacent sequences:  A109771 A109772 A109773 * A109775 A109776 A109777

KEYWORD

nonn

AUTHOR

R. K. Guy, Aug 14 2005

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Last modified February 15 08:19 EST 2012. Contains 205728 sequences.