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 A304396 #5 May 12 2018 07:26:57
%S A304396 1,7,941,597571,1077304324,4250548204220,31362344061243731,
%T A304396 389533784331698799757,7553909607396308839307729,
%U A304396 216153962578005976317428630031,8734715288242477329577387114158361,481264969283514820342197141086713669943,35132745658635258962977017094392007388046256,3317919567828983194629673950155604531470409170896
%N A304396 a(n) = A304394(n) / (n+1)^4.
%F A304396 a(n) = (n+1)^(4*n)/(n+1)! - Sum_{k=1..n} (n+1)^(4*k-4)/k! * (n-k+1)^4 * a(n-k) for n>0 with a(0)=1.
%o A304396 (PARI) /* A304394 formula: [x^n] exp( n^4*x ) * (1 - x*A(x)) = 0 */
%o A304396 {A304394(n) = my(A=[1]); for(i=0, n, A=concat(A, 0); m=#A; A[m] = Vec( exp(x*m^4 +x^2*O(x^m)) * (1 - x*Ser(A)) )[m+1] ); A[n+1]}
%o A304396 for(n=0, 25, print1( A304394(n)/(n+1)^4, ", "))
%Y A304396 Cf. A304394.
%K A304396 nonn
%O A304396 0,2
%A A304396 _Paul D. Hanna_, May 12 2018