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A104232
Triangle read by rows, based on the morphism f: 1->2, 2->3, 3->{2,1}. First row is 1. If current row is a,b,c,..., then the next row is a,b,c,...,f(a),f(b),f(c),...
0
1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 2, 1, 1, 2, 2, 3, 2, 3, 3, 2, 1, 2, 3, 3, 2, 1, 3, 2, 1, 2, 1, 3, 2, 1, 2, 2, 3, 2, 3, 3, 2, 1, 2, 3, 3, 2, 1, 3, 2, 1, 2, 1, 3, 2, 2, 3, 3, 2, 1, 3, 2, 1, 2, 1, 3, 2, 3, 2, 1, 2, 1, 3, 2, 2, 1, 3, 2, 3, 2, 2, 1, 3, 1, 2, 2, 3, 2, 3, 3, 2, 1, 2, 3, 3, 2, 1, 3, 2, 1, 2, 1
OFFSET
0,3
COMMENTS
This substitution was suggested by looking at the Kenyon border tiling substitutions.
MATHEMATICA
s[n_] := n /. {1 -> 2, 2 -> 3, 3 -> {2, 1}}; t[a_] := Join[a, Flatten[s /@ a]]; Flatten[ NestList[t, {1}, 6]]
CROSSREFS
Cf. A073058.
Sequence in context: A354582 A359312 A179868 * A072086 A180094 A333870
KEYWORD
nonn,tabf
AUTHOR
Roger L. Bagula, Apr 02 2005
STATUS
approved