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 A099198 #1 Feb 20 2005 03:00:00 %S A099198 0,7,197,8018,556014,59740609,9174170011,1904975488436, %T A099198 513771331467372,174548332364311563,72920994844093191553, %U A099198 36737130036755448717350,21961934137099746053158010,15369599839081193169161637861 %N A099198 A bisection of A002807. %o A099198 (PARI) forstep(n=2,40,2,s=0;for(k=3,n,s+=(k-1)!*binomial(n,k)/2);print1(s,", ")) %Y A099198 Cf. A002807. %K A099198 nonn %O A099198 1,2 %A A099198 Lambert Klasen (Lambert.Klasen(AT)gmx.net), Nov 16 2004