OFFSET
1,1
COMMENTS
Series of the kind m^((k^2+3k)/2) from k=1 to n was studied by Bernoulli and Euler.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..40
MATHEMATICA
aa = {}; m = 11; sum = 0; Do[sum = sum + m^((n + 3) n/2); AppendTo[aa, sum], {n, 1, 20}]; aa (*Artur Jasinski*)
Table[11^((k^2+3k)/2), {k, 10}]//Accumulate (* Harvey P. Dale, Apr 02 2020 *)
PROG
(PARI) a(n) = sum(k=1, n, 11^((k^2+3*k)/2)); \\ Michel Marcus, Sep 09 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, May 21 2010
STATUS
approved