This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A085741 a(n) = T(n)^n, where T() are the triangular numbers (A000217). 4
 1, 1, 9, 216, 10000, 759375, 85766121, 13492928512, 2821109907456, 756680642578125, 253295162119140625, 103510234140112521216, 50714860157241037295616, 29345269354638035222576971 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 FORMULA a(n) = ((n*(n+1))/2)^n. - Vincenzo Librandi, Sep 14 2011 EXAMPLE a(3) = T(3)^3 = 6^3 = 216. MAPLE a:=n->mul(sum(j, j=1..n), k=1..n): seq(a(n), n=0..13); # Zerinvary Lajos, Jun 02 2007 MATHEMATICA With[{rnn=Range[20]}, Join[{1}, First[#]^Last[#]&/@Thread[ {Accumulate[ rnn],  rnn}]]] (* Harvey P. Dale, Dec 08 2013 *) PROG (PARI) a(n) = (n*(n+1)/2)^n; \\ Michel Marcus, Feb 19 2019 (MAGMA) [((n*(n+1))/2)^n: n in [0..20]]; // Vincenzo Librandi, Sep 14 2011 CROSSREFS Cf. A000217. Essentially the same as A061718. Cf. A000312, A062206, A212333. Sequence in context: A064633 A084942 A061718 * A211044 A152288 A179153 Adjacent sequences:  A085738 A085739 A085740 * A085742 A085743 A085744 KEYWORD nonn,easy AUTHOR Jon Perry, Jul 21 2003 EXTENSIONS More terms from Ray Chandler, Nov 09 2003 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 October 15 07:56 EDT 2019. Contains 328026 sequences. (Running on oeis4.)