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 A096314 #11 Oct 26 2019 18:02:02
%S A096314 1,1,5,12,119,135,5039,20160,240219,1545075,39916799,88550154,
%T A096314 6227020799,42798202447,698726730520,10461394944000,355687428095999,
%U A096314 1375276302469251,121645100408831999,845066215769150100
%N A096314 a(n) = Sum_{1<=k<=n, gcd(n,k)=1} (-1)^(n-k)*Stirling1(n,k).
%t A096314 f[n_] := Sum[ If[ GCD[n, k] == 1, (-1)^(n - k)StirlingS1[n, k], 0], {k, n}]; Table[ f[n], {n, 20}] (* _Robert G. Wilson v_, Aug 12 2004 *)
%Y A096314 Cf. A008275.
%K A096314 easy,nonn
%O A096314 1,3
%A A096314 _Vladeta Jovovic_, Aug 01 2004
%E A096314 More terms from _Robert G. Wilson v_, Aug 12 2004