|
| |
|
|
A098630
|
|
Consider the family of multigraphs enriched by the species of parts. Sequence gives number of those multigraphs with n loops and arcs
|
|
0
| |
|
|
1, 4, 60, 1624, 66240, 3711200, 269670208, 24435113216, 2682916389632, 349223324753408, 52965538033020928
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
REFERENCES
| G. Paquin, D\'enombrement de multigraphes enrichis, M\'emoire, Math. Dept., Univ. Qu\'ebec \`a Montr\'eal, 2004.
|
|
|
FORMULA
| a(n) = 2^n*Bell(2*n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 22 2006
|
|
|
CROSSREFS
| Sequence in context: A013483 A013484 A013485 * A013502 A099705 A012488
Adjacent sequences: A098627 A098628 A098629 * A098631 A098632 A098633
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 26 2004
|
| |
|
|
