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 A062807 #17 Oct 11 2018 14:09:05
%S A062807 0,1,4,14,50,187,738,3084,13652,63917,315736,1641314,8956110,51175799,
%T A062807 305527878,1901829488,12319405728,82896050937,578485474092,
%U A062807 4180313933206,31237475311690,241063266361235,1918899090047882
%N A062807 a(n) = Sum_{i=1..n} i*(n-i)^i.
%H A062807 Harry J. Smith, <a href="/A062807/b062807.txt">Table of n, a(n) for n = 1..200</a>
%F A062807 G.f.: x*Sum_{k>=1} k*x^k/(1 - k*x)^2. - _Ilya Gutkovskiy_, Oct 11 2018
%t A062807 Table[Sum[i (n-i)^i,{i,n}],{n,30}] (* _Harvey P. Dale_, Dec 25 2017 *)
%o A062807 (PARI) a(n)={sum(i=1, n, i*(n - i)^i)} \\ _Harry J. Smith_, Aug 11 2009
%Y A062807 Cf. A101495.
%K A062807 nonn,easy
%O A062807 1,3
%A A062807 _Olivier Gérard_, Jun 23 2001
%E A062807 Prior Mathematica program replaced by _Harvey P. Dale_, Dec 25 2017