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A147719 A141479(n+1)/3. 0
1, 1, 1, 2, 6, 21, 91, 462, 2646, 16841, 117931, 900922, 7456086, 66453661, 634585771, 6463837382, 69955114326, 801626558481, 9696295037611, 123457062745842, 1650499351041366, 23116291464379301, 338474628835617451 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Sequence in context: A189243 A033540 A177479 * A231166 A115089 A304196

Adjacent sequences:  A147716 A147717 A147718 * A147720 A147721 A147722

KEYWORD

nonn

AUTHOR

Paul Curtz, Nov 11 2008

EXTENSIONS

More terms from R. J. Mathar, Jan 22 2009

STATUS

approved

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Last modified June 19 23:39 EDT 2019. Contains 324222 sequences. (Running on oeis4.)