A026978 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026659.

1, 8, 41, 208, 856, 4540, 18527, 86896, 343976, 1794146, 7114521, 33019048, 129946039, 674164700, 2656947487, 12352433072, 48571744683, 251186392774, 988685996629, 4614598284024, 18151637670487, 93662525206528, 368685987098199, 1727749480803800, 6800520785920773

Offset

2,2

Links

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

Crossrefs

Sequence in context: A199846 A188180 A026968 * A037577 A265149 A209822

Adjacent sequences: A026975 A026976 A026977 * A026979 A026980 A026981

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved