A026115 a(n) = T(2n,n-1), where T is the array defined in A026105.

1, 3, 15, 77, 413, 2266, 12636, 71290, 405790, 2325923, 13406666, 77632590, 451270925, 2631763500, 15391191315, 90230338449, 530098757210, 3120158068370, 18395925762046, 108621483748778, 642235028537889, 3801900814767378, 22531392119093175, 133663824177577317

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Crossrefs

Cf. A026105.

Sequence in context: A037766 A037654 A074561 * A027911 A125700 A227954

Adjacent sequences: A026112 A026113 A026114 * A026116 A026117 A026118

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 16 2019

Status

approved