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A106703 4-symbol substitution from L[n] Coxeter diagram with n=3. 0
1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Characteristic Polynomial n=3: x^4-7*x^3+9 These Coxeter diagrams behave very much like odd even blocks or branches.

REFERENCES

L[n] substitutions of the Coxeter diagram from the McMullen article.

Curtis McMullen, Prym varieties and Teichmuller curves.

LINKS

Table of n, a(n) for n=0..104.

FORMULA

1->{3}*n, 2->{3, 4}, 3->{1, 2}, 4->{2}*n.

MATHEMATICA

s[1] = Table[If[i <= n, 3, {}], {i, 1, n0}]; s[2] = {3, 4}; s[3] = {1, 2}; s[4] = Table[If[i <= n, 2, {}], {i, 1, n0}]; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[6]

CROSSREFS

Sequence in context: A117277 A033831 A033105 * A127267 A268173 A008617

Adjacent sequences:  A106700 A106701 A106702 * A106704 A106705 A106706

KEYWORD

nonn,uned

AUTHOR

Roger L. Bagula, May 09 2005

STATUS

approved

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Last modified February 24 16:44 EST 2020. Contains 332209 sequences. (Running on oeis4.)