A030438 a(n) = A030019(n)*n! (or A035051*(n-1)!).

1, 1, 2, 24, 696, 37320, 3201840, 401914800, 69458497920, 15813882201600, 4587474713068800, 1651825133370720000, 722868238335090355200, 377862727500237858278400, 232536825223980698118297600

Offset

0,3

References

Warren D. Smith and David Warme, Paper in preparation, 2002.

Links

Table of n, a(n) for n=0..14.

Index entries for sequences related to rooted trees

Formula

a(n) = (n-1)! Sum_{i=0}^{n-1} Stirling2(n-1, i) n^i, n >= 1.

Crossrefs

Cf. A030019, A035051.

Sequence in context: A012750 A174997 A009750 * A012723 A354335 A069150

Adjacent sequences: A030435 A030436 A030437 * A030439 A030440 A030441

Keyword

nonn

Author

David Warme (warme(AT)s3i.com)

Status

approved