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 A354479 #9 Jun 03 2022 07:43:24
%S A354479 1,1,6,33,4200,4192200,5115600,545250747888,10086416728304192640,
%T A354479 126556188275836361347200,451535899566923284351392000,
%U A354479 250606479905655959999200124455664175360,1493469115548888160803495265626573200563200,47083781674990641531154175811928872812783834939059200
%N A354479 a(n) is the denominator of Sum_{k=1..n} 1 / Stirling1(n,k).
%e A354479 1, 0, 7/6, 25/33, 3991/4200, 3923773/4192200, 4901627/5115600, 527165212865/545250747888, ...
%t A354479 Table[Sum[1/StirlingS1[n, k], {k, 1, n}], {n, 1, 14}] // Denominator
%o A354479 (PARI) a(n) = denominator(sum(k=1, n, 1/stirling(n, k, 1))); \\ _Michel Marcus_, Jun 02 2022
%Y A354479 Cf. A008275, A046826, A112289, A112291, A354478 (numerators).
%K A354479 nonn,frac
%O A354479 1,3
%A A354479 _Ilya Gutkovskiy_, Jun 02 2022