%I A031972
%S A031972 1,6,39,340,3905,55986,960799,19173960,435848049,11111111110,
%T A031972 313842837671,9726655034460,328114698808273,11966776581370170,
%U A031972 469172025408063615,19676527011956855056,878942778254232811937
%N A031972 Sum n^k, k=1..n.
%F A031972 a(1)=1; for n>1 a(n) = (n^(n+1)-1)/(n-1) - 1. - Benoit Cloitre (benoit7848c(AT)orange.fr), 
               Aug 17 2002
%Y A031972 Sequence in context: A007322 A058191 A113347 this_sequence A124577 A006678 
               A145709
%Y A031972 Adjacent sequences: A031969 A031970 A031971 this_sequence A031973 A031974 
               A031975
%K A031972 nonn
%O A031972 1,2
%A A031972 N. J. A. Sloane (njas(AT)research.att.com).