This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A178186 Sum 3^((k^2+3k)/2) from k=1 to n. 1
 9, 252, 19935, 4802904, 3491587305, 7629089072292, 50039174188071999, 984820941357799304880, 58150721823981417489695049, 10301109611599361435391036962892, 5474411390529830981438591324606714655 (list; graph; refs; listen; history; text; internal format)
 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..60 MATHEMATICA aa = {}; m = 3; sum = 0; Do[sum = sum + m^((n + 3) n/2); AppendTo[aa, sum], {n, 1, 20}]; aa (*Artur Jasinski*) PROG (PARI) a(n) = sum(k=1, n, 3^((k^2+3*k)/2)); \\ Michel Marcus, Sep 09 2013 CROSSREFS Cf. A178184-A178193. Sequence in context: A158621 A256019 A135484 * A212290 A296950 A025133 Adjacent sequences:  A178183 A178184 A178185 * A178187 A178188 A178189 KEYWORD nonn AUTHOR Artur Jasinski, May 21 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 22 14:32 EDT 2019. Contains 323480 sequences. (Running on oeis4.)