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A137340 a(n)=2a(n-1)+3a(n-2). 0
1, 9, 21, 69, 201, 609, 1821, 5469, 16401, 49209 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Sequence in context: A262055 A193276 A173084 * A075640 A147480 A146396

Adjacent sequences:  A137337 A137338 A137339 * A137341 A137342 A137343

KEYWORD

nonn

AUTHOR

Paul Curtz, Apr 21 2008

STATUS

approved

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Last modified April 21 22:12 EDT 2019. Contains 322328 sequences. (Running on oeis4.)