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 A112568 #9 Jun 23 2020 10:54:08
%S A112568 1,3,13,61,241,1051,5041,20161,91081,392041,1681681,6530173,27168961,
%T A112568 115590931
%N A112568 Secondary diagonal of square table A112564 of generalized Flavius Josephus sieves.
%H A112568 <a href="/index/J#Josephus">Index entries for sequences related to the Josephus Problem</a>
%o A112568 (PARI) {a(n)=local(A=n,B=0,k=0);if(n==0,1, until(A==B,k=k+1;if(k%(n+1)==0,k=k+1);B=A;A=floor(A*(k+1)/k));1+A)}
%Y A112568 Cf. A112564, A112565.
%K A112568 more,nonn
%O A112568 1,2
%A A112568 _Paul D. Hanna_, Oct 14 2005