A054117 T(n,n-2), array T as in A054115.

1, 6, 30, 150, 870, 5910, 46230, 409110, 4037910, 43954710, 522956310, 6749977110, 93928268310, 1401602636310, 22324392524310, 378011820620310, 6780385526348310

Offset

2,2

Links

Table of n, a(n) for n=2..18.

Jan Kneissler, The number of primitive Vassiliev invariants of degree up to 12, arXiv:q-alg/9706022, 1997; Section 6.1.

Formula

Conjecture: a(n) -(n+1)*a(n-1) +n*a(n-2)=0. - R. J. Mathar, Jun 13 2013

Crossrefs

Sequence in context: A003948 A105488 A252699 * A033132 A022023 A066534

Adjacent sequences: A054114 A054115 A054116 * A054118 A054119 A054120

Keyword

nonn

Author

Clark Kimberling

Status

approved