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 A106654 Four-symbol substitution, characteristic polynomial: x^4-x^2-x-1. 0
 4, 1, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Digraph matrix is: M={{0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}, {1, 1, 1, 0}} LINKS Table of n, a(n) for n=0..104. FORMULA 1->{2}, 2->{3}, 3->{4}, 5->{1, 2, 3} MATHEMATICA s[1] = {2}; s[2] = {3}; s[3] = {4}; s[4] = {1, 2, 3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[15] CROSSREFS Sequence in context: A131100 A321091 A064124 * A252094 A196138 A198185 Adjacent sequences: A106651 A106652 A106653 * A106655 A106656 A106657 KEYWORD nonn,uned AUTHOR Roger L. Bagula, May 12 2005 STATUS approved

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Last modified May 29 13:20 EDT 2023. Contains 363042 sequences. (Running on oeis4.)