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A026559 a(n) = T(2n,n-1), T given by A026552. 0
1, 3, 12, 45, 180, 721, 2940, 12069, 49935, 207691, 867900, 3640429, 15319395, 64643580, 273431408, 1158988141, 4921651521, 20934115963, 89173404140 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A192467 A151162 A094547 * A188949 A184699 A008781

Adjacent sequences:  A026556 A026557 A026558 * A026560 A026561 A026562

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified February 15 20:26 EST 2012. Contains 205852 sequences.