A061250 a(n) = (n-2)*(n-1)^n.

0, 0, 8, 162, 3072, 62500, 1399680, 34588806, 939524096, 27894275208, 900000000000, 31384283767210, 1176925259169792, 47248516628391468, 2022385242251558912, 91957716979980468750, 4427218577690292387840, 225009351233083599856144, 12040000871040740498079744

Offset

1,3

Links

Table of n, a(n) for n=1..19.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Mathematica

Table[(n-2)*(n-1)^n, {n, 20}] (* Vladimir Joseph Stephan Orlovsky, Jan 29 2012 *)

Crossrefs

Cf. A143857. [From Reinhard Zumkeller, Jul 23 2010]

Sequence in context: A171461 A065116 A240410 * A183813 A222274 A061711

Adjacent sequences: A061247 A061248 A061249 * A061251 A061252 A061253

Keyword

nonn,easy

Author

Gero Burghardt (gerogoestohollywood(AT)yahoo.de), Jun 01 2001

Extensions

More terms from Klaus Brockhaus and Larry Reeves (larryr(AT)acm.org), Jun 03 2001

Status

approved