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A051407 3^n*(3^(n+1)+1)/2. 0
2, 15, 126, 1107, 9882, 88695, 797526, 7175547, 64573362, 581140575, 5230206126, 47071677987, 423644570442, 3812799539655, 34315191073926, 308836705316427, 2779530304801122, 25015772614069935, 225141953139208926, 2026277577090618867 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A127610 A085228 A055866 * A132182 A140306 A143924

Adjacent sequences:  A051404 A051405 A051406 * A051408 A051409 A051410

KEYWORD

nonn

AUTHOR

Colin Mallows

STATUS

approved

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Last modified May 18 21:01 EDT 2013. Contains 225428 sequences.