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%I
%S 1,1,1,2,1,2,1,2,1,2,1,3,1,2,1,2,1,2,1,2,1,2,1,3,1,2,1,2,1,2,1,2,1,2,
%T 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,3,1,2,1,2,1,2,1,2,
%U 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1
%N Number of subgroups of order n in special orthogonal group SO(3).
%F Has period 1, 2 except for a(2) = 1, a(12) = a(24) = a(60) = 3.
%e The groups are "nn", of order n; "22n", of order 2n; "332", "432", "532" of orders 12,24,60.
%Y The main sequences concerned with group theory are A000001, A000679, A001034, A001051, A001228, A005180, A000019, A000637, A000638, A002106, A005432, A051881.
%K nonn,easy,nice
%O 1,4
%A J. H. Conway, conway(AT)math.princeton.edu
%E More terms from _James A. Sellers_ and _David W. Wilson_ Dec 16 1999
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