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 A063411 #7 May 10 2013 12:44:50
%S A063411 0,0,0,5040,6249600,15958978560,138492255928320,3264016697241108480,
%T A063411 167083534977568918732800,26809984170742141560784158720,
%U A063411 15381567503446460704398211326935040
%N A063411 Number of cyclic subgroups of order 8 of general affine group AGL(n,2).
%C A063411 Number of cyclic subgroups of order m in general affine group AGL(n,2) is 1/phi(m)*Sum_{d|m} mu(m/d)*b(n,d), where b(n,d) is number of solutions to x^d=1 in AGL(n,2).
%H A063411 V. Jovovic, <a href="/A062766/a062766.pdf">Cycle index of general affine group AGL(n,2)</a>
%F A063411 a(n) = (A063391(n)-A063387(n))/4.
%Y A063411 Cf. A063406-A063413, A063385-A063393, A062710.
%K A063411 nonn
%O A063411 1,4
%A A063411 _Vladeta Jovovic_, Jul 17 2001