%I #2 Mar 31 2012 14:02:21
%S 1,2,2,1,4,1,2,2,1,2,2,1,4,1,2,2,1,2,2,1,2,2,1,4,1,2,2,1,2,2,1,4,1,2,
%T 2,1,2,2,1,2,2,1,4,1,2,2,1,2,2,1,4,1,2,2,1,4,1,2,2,1,4,1,2,2,1,2,2,1,
%U 4,1,2,2,1,4,1,2,2,1,4,1,2,2,1,2,2,1,4,1,2,2,1,2,2,1,2,2,1,4,1,2,2,1
%N First differences of A112055.
%C Will other terms than 1, 2 or 4 ever appear? Is there genuine periodicity?
%F a(n) = A112055(n+1)-A112055(n).
%K nonn
%O 1,2
%A _Antti Karttunen_, Aug 28 2005