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A027120 a(n) = A027113(n, 2n-2). 0
2, 7, 20, 56, 155, 429, 1188, 3298, 9181, 25634, 71781, 201569, 567538, 1601971, 4532460, 12851882, 36516613, 103955432, 296471643, 846932919, 2423256440, 6943726380, 19924638557, 57247669927, 164688166948, 474323305547 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..27.

CROSSREFS

Sequence in context: A000149 A080041 A049681 * A094982 A292400 A007460

Adjacent sequences:  A027117 A027118 A027119 * A027121 A027122 A027123

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 12 06:22 EDT 2020. Contains 336438 sequences. (Running on oeis4.)