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 A100043 #10 Dec 07 2019 12:18:24 %S A100043 2,120,40320,39916800,87178291200,355687428096000,2432902008176640000, %T A100043 25852016738884976640000,403291461126605635584000000, %U A100043 8841761993739701954543616000000,263130836933693530167218012160000000 %N A100043 a(n) = (3*n-1)!. %p A100043 seq( (3*n-1)!,n=1..13); %o A100043 (Sage) [stirling_number1(3*n,1) for n in range(1, 22)] # _Zerinvary Lajos_, Nov 26 2009 %K A100043 nonn %O A100043 1,1 %A A100043 _Jorge Coveiro_, Dec 26 2004