A026973 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026648.

1, 8, 52, 224, 1131, 4620, 23456, 92752, 460170, 1805760, 8946216, 34942176, 172593267, 673129380, 3323413216, 12954246368, 63944790462, 249263001360, 1230668687000, 4798770328960, 23700302314238, 92457112946968, 456814709763456, 1782991313610720, 8813232700137268

Offset

2,2

Links

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

Crossrefs

Sequence in context: A024179 A302816 A026963 * A244718 A303509 A107584

Adjacent sequences: A026970 A026971 A026972 * A026974 A026975 A026976

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 20 2019

Status

approved