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 A202626 #7 Mar 30 2012 16:52:08 %S A202626 0,5,0,3,624,125,0,7,6560,4905,0,11,28560,104845,0,15,83520,2236945,0, %T A202626 19,194480,43997205,0,23,390624,839065625,0,27,707280,15568306205,0, %U A202626 31,1185920,283472166945,0,35,1874160,5085221879845,0,39,2825760,90160039460905,0,43,4100624,1583296366510125,0,47,5764800,27584549361811505,0,51,7890480 %N A202626 Order of Fibonacci group F(n,4) (or 0 if the group is infinite). %C A202626 A column of the array described in A202624. See that entry for references. %p A202626 g:=k->(4*k+1)*(2^(4*k+1)+(-1)^k*2^(2*k+1)+1); %p A202626 f:=n-> if n mod 4 = 0 then n-1 elif n mod 4 = 1 then n^4-1 elif n mod 4 = 2 then g((n-2)/4); else 0; fi; %p A202626 [seq(f(n),n=1..60)]; %Y A202626 Cf. A202624. A202628 is a subsequence. %K A202626 nonn %O A202626 1,2 %A A202626 _N. J. A. Sloane_, Dec 30 2011