A273435 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

4,2

LINKS

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

FORMULA

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

CROSSREFS

Column k=4 of A060281.

Sequence in context: A166840 A166828 A053509 * A259345 A181201 A089507

Adjacent sequences: A273432 A273433 A273434 * A273436 A273437 A273438

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 22 2016

STATUS

approved