A098091 Graded dimension of the space of invariant bilinear forms on the free pre-Lie algebra on one generator.

1, 1, 4, 7, 17, 36, 88, 196, 481, 1148, 2838, 7020, 17708, 44837, 114971, 296457

Offset

5,3

Comments

The sequence starts at index 5 because the previous terms vanish.

Links

Table of n, a(n) for n=5..20.

Crossrefs

This is related in some sense to A000081.

Sequence in context: A023860 A009881 A049944 * A319782 A057450 A077274

Adjacent sequences: A098088 A098089 A098090 * A098092 A098093 A098094

Keyword

nonn

Author

F. Chapoton, Sep 14 2004

Status

approved