This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A085741 #25 Sep 08 2022 08:45:11
%S A085741 1,1,9,216,10000,759375,85766121,13492928512,2821109907456,
%T A085741 756680642578125,253295162119140625,103510234140112521216,
%U A085741 50714860157241037295616,29345269354638035222576971
%N A085741 a(n) = T(n)^n, where T() are the triangular numbers (A000217).
%H A085741 Vincenzo Librandi, <a href="/A085741/b085741.txt">Table of n, a(n) for n = 0..200</a>
%F A085741 a(n) = ((n*(n+1))/2)^n. - _Vincenzo Librandi_, Sep 14 2011
%e A085741 a(3) = T(3)^3 = 6^3 = 216.
%p A085741 a:=n->mul(sum(j, j=1..n),k=1..n): seq(a(n), n=0..13); # _Zerinvary Lajos_, Jun 02 2007
%t A085741 With[{rnn=Range[20]},Join[{1},First[#]^Last[#]&/@Thread[ {Accumulate[ rnn], rnn}]]] (* _Harvey P. Dale_, Dec 08 2013 *)
%o A085741 (PARI) a(n) = (n*(n+1)/2)^n; \\ _Michel Marcus_, Feb 19 2019
%o A085741 (Magma) [((n*(n+1))/2)^n: n in [0..20]]; // _Vincenzo Librandi_, Sep 14 2011
%Y A085741 Cf. A000217.
%Y A085741 Essentially the same as A061718.
%Y A085741 Cf. A000312, A062206, A212333.
%K A085741 nonn,easy
%O A085741 0,3
%A A085741 _Jon Perry_, Jul 21 2003
%E A085741 More terms from _Ray Chandler_, Nov 09 2003