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 A304397 #5 May 12 2018 07:27:39
%S A304397 1,15,9240,42073400,746084307150,36924991021460826,
%T A304397 4160715480354842294820,930665660288187073185443460,
%U A304397 374501250148595690153122892776875,251774218429254711234735482839554308125,266963725952364568003002013640838639863625156,426348840739731769879201369387693893984897112621140,987611583043183483323383128203849669908583985607235622200
%N A304397 a(n) = A304395(n) / (n+1)^5.
%F A304397 a(n) = (n+1)^(5*n)/(n+1)! - Sum_{k=1..n} (n+1)^(5*k-5)/k! * (n-k+1)^5 * a(n-k) for n>0 with a(0)=1.
%o A304397 (PARI) /* A304395 formula: [x^n] exp( n^5*x ) * (1 - x*A(x)) = 0 */
%o A304397 {A304395(n) = my(A=[1]); for(i=0, n, A=concat(A, 0); m=#A; A[m] = Vec( exp(x*m^5 +x^2*O(x^m)) * (1 - x*Ser(A)) )[m+1] ); A[n+1]}
%o A304397 for(n=0, 25, print1( A304395(n)/(n+1)^5, ", "))
%Y A304397 Cf. A304395.
%K A304397 nonn
%O A304397 0,2
%A A304397 _Paul D. Hanna_, May 12 2018