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A106796
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Fixed point of the morphism 1 -> 1,1,2; 2 -> 3; 3 -> 1,4; 4 -> 1, starting with a(0) = 1.
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4
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1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 3, 1, 4, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 3, 1, 4, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 3, 1, 4, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 3, 1, 4, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 3, 1, 4, 1, 1, 2, 1, 1, 2, 3
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OFFSET
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0,3
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COMMENTS
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4-symbol substitution for the Pisot characteristic polynomial: x^4 - 2*x^2 - x - 1.
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LINKS
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EXAMPLE
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The first few steps of the substitution are:
Start: 1
Maps:
1 --> 1 1 2
2 --> 3
3 --> 1 4
4 --> 1
-------------
0: (#=1)
1
1: (#=3)
112
2: (#=7)
1121123
3: (#=16)
1121123112112314
4: (#=36)
112112311211231411211231121123141121
5: (#=82)
1121123112112314112112311211231411211121123112112314112112311211231411211121123112
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MATHEMATICA
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s[1]= {1, 1, 2}; s[2]= {3}; s[3]= {1, 4}; s[4]= {1}; t[b_]:= Flatten[s /@ b];
a[0]= {1}; a[1]= t[p[0]]; a[n_]:= t[a[n-1]];
a[10]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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