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 A062250 #6 May 10 2013 12:44:47
%S A062250 1,5,79,6974,2037136,2890467344,14011554132032,325330342132674560,
%T A062250 27173394819858612320256,10158190320726534408118452224,
%U A062250 13156630408268153048253765001412608,80280189722884518774834501142737770774528
%N A062250 Number of cyclic subgroups of Chevalley group A_n(2) (the group of nonsingular n X n matrices over GF(2) ).
%D A062250 V. Jovovic, The cycle index polynomials of some classical groups, Belgrade, 1995, unpublished.
%H A062250 V. Jovovic, <a href="/A062766/a062766.pdf">Cycle index of general linear group GL(n,2)</a>
%F A062250 a(n) = Sum_{d} |{g element of A_n(2): order(g)=d}|/phi(d), where phi=Euler totient function, cf. A000010.
%e A062250 a(3) = 1/phi(1)+21/phi(2)+56/phi(3)+42/phi(4)+48/phi(7) = 79.
%Y A062250 Cf. A053651 (unlabeled case), A053658, A053660, A053718, A053722, A053725, A053771-A053777, A058502, A062552, A062240.
%K A062250 nonn
%O A062250 1,2
%A A062250 Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 01 2001
%E A062250 More terms from _Vladeta Jovovic_, Jul 04 2001