A026158 a(n) = T(3n,n), where T is the array in A026148.

1, 2, 16, 120, 946, 7644, 62831, 522784, 4389779, 37123554, 315735122, 2697813440, 23140821753, 199142458570, 1718554831623, 14866697304316, 128879838356309, 1119350439620210, 9737942597361615, 84842252277338304, 740178198190767003, 6465231396756806046

Offset

0,2

Links

Table of n, a(n) for n=0..21.

Crossrefs

Sequence in context: A086854 A258683 A026129 * A025185 A090672 A200820

Adjacent sequences: A026155 A026156 A026157 * A026159 A026160 A026161

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 18 2019

Status

approved