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 A316777 #39 Feb 16 2025 08:33:56
%S A316777 1,33,7809,7970433,24891170433,193516654370433,3252209580756770433,
%T A316777 106565314598088199970433,6292489787293574101716770433,
%U A316777 629244614687684894925781716770433,101340090272908294280184341461716770433,25216602106682627624613336066827221716770433
%N A316777 a(n) = Sum_{k=1..n} (k!)^5.
%H A316777 Seiichi Manyama, <a href="/A316777/b316777.txt">Table of n, a(n) for n = 1..120</a>
%H A316777 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FactorialSums.html">Factorial Sums</a>
%t A316777 Accumulate[(Range[15]!)^5] (* _Harvey P. Dale_, Jan 24 2021 *)
%o A316777 (PARI) {a(n) = sum(k=1, n, k!^5)}
%Y A316777 Sum_{k=1..n} (k!)^m: A007489 (m=1), A104344 (m=2), A138564 (m=3), A289945 (m=4), this sequence (m=5), A289946 (m=6).
%K A316777 nonn
%O A316777 1,2
%A A316777 _Seiichi Manyama_, Aug 03 2018