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 A027486 #18 Nov 06 2019 17:48:33
%S A027486 1,3,23,330,7604,256620,11923260,729524880,56840099904,5493503695680,
%T A027486 644870893060800,90366972897801600,14899694352066120960,
%U A027486 2855250418022402400000,629258349435218754451200,158034681938560927788288000,44866854739192779425625292800
%N A027486 First column of triangle A027477, constructed from the Stirling numbers of the first kind.
%F A027486 a(n) = A027477(n,1).
%F A027486 a(n) = n!*Sum_{k=1..n} (-1)^(n-k)*Stirling1(n, k)/k. Sum_{n>=0} a(n)*x^n/n!^2 = -log(log(1-x))-Ei(1, log(1-x))-gamma. - _Vladeta Jovovic_, Jan 29 2005
%Y A027486 Cf. A027477 (Square of normalized Stirling matrix of the first kind).
%K A027486 nonn,easy
%O A027486 1,2
%A A027486 _Olivier Gérard_
%E A027486 More terms from _Sean A. Irvine_, Nov 06 2019