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Search: id:A081209
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A081209 Sum_{k=0..n} (-1)^(n-k)*n^k. +0
6
1, 0, 3, 20, 205, 2604, 39991, 720600, 14913081, 348678440, 9090909091, 261535698060, 8230246567621, 281241170407092, 10371206370520815, 410525522232055664, 17361641481138401521, 781282469559318055056 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n) = (n^(n+1)+(-1)^n)/(n+1).

CROSSREFS

Cf. A031973.

Sequence in context: A054361 A052595 A052590 this_sequence A014068 A006963 A113333

Adjacent sequences: A081206 A081207 A081208 this_sequence A081210 A081211 A081212

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 17 2003

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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