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 A289949 #17 Nov 29 2020 11:56:07
%S A289949 1,2,18,1314,333090,207693090,268946253090,645510228813090,
%T A289949 2643553803594573090,17342764866576345933090,
%U A289949 173418555892594089945933090,2538940579958951120707545933090,52646414799433780559063261145933090,1503614384819523432725006336630745933090
%N A289949 a(n) = Sum_{k=0..n} k!^4.
%H A289949 Seiichi Manyama, <a href="/A289949/b289949.txt">Table of n, a(n) for n = 0..144</a>
%F A289949 a(n) = A289945(n) + 1 for n > 0.
%t A289949 Accumulate[(Range[0,15]!)^4] (* _Harvey P. Dale_, Nov 29 2020 *)
%o A289949 (PARI) a(n) = sum(k=0, n, k!^4); \\ _Michel Marcus_, Jul 16 2017
%Y A289949 Cf. A289945.
%Y A289949 Sum_{k=0..n} k!^m: A003422(n+1) (m=1), A061062 (m=2), A289948 (m=3), this sequence (m=4).
%K A289949 nonn
%O A289949 0,2
%A A289949 _Seiichi Manyama_, Jul 16 2017