A026984 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026670.

1, 10, 68, 394, 2011, 10258, 47327, 229186, 1007891, 4752128, 20351196, 94455408, 398021603, 1828645056, 7624936963, 34786976248, 144011195937, 653694082256, 2692363924059, 12174658758744, 49956496140401, 225233631148500, 921619221445645, 4145493852959640, 16926389947869331

Offset

3,2

Links

Table of n, a(n) for n=3..27.

Crossrefs

Sequence in context: A144052 A280438 A192021 * A104598 A026901 A027242

Adjacent sequences: A026981 A026982 A026983 * A026985 A026986 A026987

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved