A106654 Four-symbol substitution, characteristic polynomial: x^4-x^2-x-1.

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

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: A321091 A375576 A064124 * A252094 A196138 A198185

Adjacent sequences: A106651 A106652 A106653 * A106655 A106656 A106657

Keyword

nonn,uned

Author

Roger L. Bagula, May 12 2005

Status

approved