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%I #6 Jul 05 2018 02:08:12
%S 1,3,4,7,3,13,3,15,6,10,3,32,3,10,13,26,3,20,3,25,13,10,3,75,5,10,8,
%T 25,3,48,3,37,13,10,10,50,3,10,13,60,3,48,3,25,20,10,3,135,5,17,13,25,
%U 3,27,10,60,13,10,3,127,3,10,20,48,10,48,3,25,13,38
%N Number of normal subgroups of the special linear group SL(2, Z_n).
%o (GAP) Concatenation([1], List([2..20], n->Size(NormalSubgroups(SL(2, Integers mod n)))));
%Y Cf. A000056, A066541.
%K nonn
%O 1,2
%A _Andrew Howroyd_, Jul 04 2018
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