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%I #4 Mar 30 2012 17:34:15
%S 2,4,1,2,4,1,3,1,2,4,1,2,4,1,3,1,3,4,3,1,3,1,2,4,1,2,4,1,3,1,2,4,1,2,
%T 4,1,3,1,3,4,3,1,3,1,3,4,3,2,4,3,4,3,1,3,1,3,4,3,1,3,1,2,4,1,2,4,1,3,
%U 1,2,4,1,2,4,1,3,1,3,4,3,1,3,1,2,4,1,2,4,1,3,1,2,4,1,2,4,1,3,1,3,4,3,1,3,1
%N A four-symbol substitution with characteristic polynomial x^4-x-1.
%C A minimal Pisot like substitution, but in 4 symbols.
%F 1->{2, 4}, 2->{3, 4}, 3->{1}, 4->{3}
%t s[1] = {2, 4}; s[2] = {3, 4}; s[3] = {1}; s[4] = {3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[16]
%K nonn,uned
%O 0,1
%A _Roger L. Bagula_, May 12 2005
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