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A031972
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Sum n^k, k=1..n.
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3
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1, 6, 39, 340, 3905, 55986, 960799, 19173960, 435848049, 11111111110, 313842837671, 9726655034460, 328114698808273, 11966776581370170, 469172025408063615, 19676527011956855056, 878942778254232811937
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(1)=1; for n>1 a(n) = (n^(n+1)-1)/(n-1) - 1. - Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 17 2002
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MATHEMATICA
| f[n_]:=Sum[n^k, {k, n}]; Array[f, 30] (*From Vladimir Joseph Stephan Orlovsky, Feb 14 2011*)
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CROSSREFS
| Sequence in context: A007322 A058191 A113347 * A124577 A006678 A145709
Adjacent sequences: A031969 A031970 A031971 * A031973 A031974 A031975
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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