A085390 a(n) = (n(n+1)^(n-2)+0^(n-2))/(n+1).

1, 3, 20, 180, 2058, 28672, 472392, 9000000, 194871710, 4729798656, 127253992476, 3760310514688, 121096582031250, 4222124650659840, 158473248526494992, 6371827248895377408, 273260286537746369382, 12451840000000000000000

Offset

2,2

Comments

A diagonal of square array A085388.

Links

Table of n, a(n) for n=2..19.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Crossrefs

Cf. A085389, A053506.

Sequence in context: A242164 A129840 A358214 * A212789 A065980 A302581

Adjacent sequences: A085387 A085388 A085389 * A085391 A085392 A085393

Keyword

easy,nonn

Author

Paul Barry, Jun 30 2003

Status

approved