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A026129 a(n) = T(3n,n), where T is the array in A026120. 0
1, 2, 16, 120, 945, 7630, 62678, 521264, 4375359, 36990200, 314520602, 2686858784, 23042640803, 198266292798, 1710759087810, 14797477375776, 128266110749332, 1113914431675710, 9689827680172220, 84416582373480000, 736413484617492927, 6431941663589330086, 56239398241150978776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A046105 A086854 A258683 * A026158 A025185 A090672

Adjacent sequences:  A026126 A026127 A026128 * A026130 A026131 A026132

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Corrected and extended by Sean A. Irvine, Sep 17 2019

STATUS

approved

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Last modified October 29 18:53 EDT 2020. Contains 338067 sequences. (Running on oeis4.)