A026983 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.

1, 8, 47, 224, 1130, 4868, 23404, 97230, 457264, 1868456, 8679894, 35162196, 162087345, 653396608, 2996092939, 12041970574, 55006554003, 220673343660, 1005105011265, 4027407386110, 18302390130349, 73278803406040, 332412585527847, 1330205838019114, 6025308727310905

Offset

2,2

Links

Table of n, a(n) for n=2..26.

Crossrefs

Sequence in context: A085299 A160640 A230622 * A296331 A081279 A099110

Adjacent sequences: A026980 A026981 A026982 * A026984 A026985 A026986

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved