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 A063408 #7 May 10 2013 12:44:50
%S A063408 0,0,0,5376,2666496,895942656,260079353856,5663488009568256,
%T A063408 731639373896934752256,63867566904037836331155456,
%U A063408 4781235184059094238818788704256,436966645827601226875601365191622656
%N A063408 Number of cyclic subgroups of order 5 of general affine group AGL(n,2).
%C A063408 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 A063408 V. Jovovic, <a href="/A062766/a062766.pdf">Cycle index of general affine group AGL(n,2)</a>
%F A063408 a(n) = (A063388(n)-1)/4.
%Y A063408 Cf. A063406-A063413, A063385-A063393, A062710.
%K A063408 nonn
%O A063408 1,4
%A A063408 _Vladeta Jovovic_, Jul 17 2001