A273435 Number of endofunctions on [n] with exactly four cycles.

1, 30, 745, 18515, 484729, 13591116, 409987640, 13303809750, 463397746636, 17276343754098, 687247936771032, 29079485483123985, 1304889365985201424, 61922948839969015928, 3099416199490785094272, 163229892984351540698188, 9024648860521246301700096

Offset: 4

Author

Alois P. Heinz, May 22 2016

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 4..386

Crossrefs

Column k=4 of A060281.

Formula

E.g.f.: 1/24 * log(1+LambertW(-x))^4.