A085389 a(n) = (n*(n+1)^(n-1) + 0^n)/(n+1).

1, 2, 12, 100, 1080, 14406, 229376, 4251528, 90000000, 2143588810, 56757583872, 1654301902188, 52644347205632, 1816448730468750, 67553994410557440, 2694045224950414864, 114692890480116793344, 5191945444217181018258

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Formula

Main subdiagonal of A085388.

a(n) = A055865(n), n>1. - R. J. Mathar, Sep 12 2008

a(n) = [x^n] x*(1 - x)/(1 - x - n*x). - Ilya Gutkovskiy, Oct 02 2017

Crossrefs

Cf. A053506, A085390.

Sequence in context: A124102 A168365 A055865 * A202013 A151505 A096347

Adjacent sequences: A085386 A085387 A085388 * A085390 A085391 A085392

Keyword

easy,nonn

Author

Paul Barry, Jun 30 2003

Status

approved