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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
OFFSET
0,2
CROSSREFS
Sequence in context: A046105 A086854 A258683 * A026158 A025185 A090672
KEYWORD
nonn
EXTENSIONS
Corrected and extended by Sean A. Irvine, Sep 17 2019
STATUS
approved