A027296 a(n) = Sum_{k=0..floor((n-1)/2)} T(n,k) * T(n,k+2), with T given by A026022.

1, 6, 22, 100, 345, 1470, 5096, 21120, 74175, 302698, 1076922, 4352140, 15660827, 62876490, 228468272, 913093664, 3345466023, 13326904266, 49176362780, 195434713432, 725586231766, 2878605745972, 10744342665072, 42571577779200, 159638882959595, 631933882236306

Offset

2,2

Links

Table of n, a(n) for n=2..27.

Crossrefs

Cf. A026022.

Sequence in context: A240049 A078418 A100300 * A179601 A151495 A193463

Adjacent sequences: A027293 A027294 A027295 * A027297 A027298 A027299

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved