%I A060817
%S A060817 1,1,2,24,120,1440,5040,40320,362880,3628800,39916800,479001600,
%T A060817 6227020800,87178291200,1307674368000,20922789888000,355687428096000,
%U A060817 6402373705728000,121645100408832000,2432902008176640000
%N A060817 Size of the automorphism group of the alternating group A_n.
%C A060817 For all n except n=2, n=3 and n=6, Aut(A_n) is S_n i.e. a(n) = n! while 
               Aut(A_2) = S_1, Aut(A_3) = Aut(C_3) = C_2 = S_2 and Aut(A_6) contains 
               S_6 as a subgroup of index 2.
%Y A060817 A060249, A001710.
%Y A060817 Sequence in context: A009538 A009556 A034310 this_sequence A045820 A098455 
               A078994
%Y A060817 Adjacent sequences: A060814 A060815 A060816 this_sequence A060818 A060819 
               A060820
%K A060817 nonn
%O A060817 1,3
%A A060817 Ola Veshta (olaveshta(AT)my-deja.com), Apr 29 2001