A026129 a(n) = T(3n,n), where T is the array in A026120.

1, 2, 16, 120, 945, 7630, 62678, 521264, 4375359, 36990200, 314520602, 2686858784, 23042640803, 198266292798, 1710759087810, 14797477375776, 128266110749332, 1113914431675710, 9689827680172220, 84416582373480000, 736413484617492927, 6431941663589330086, 56239398241150978776

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