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A105105 Triangle read by rows, based on the morphism f: 1-> 2->3 3->{6,5,4} 4->5 5->6 6->{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, 6, 5, 4, 1, 2, 2, 3, 2, 3, 3, 6, 5, 4, 2, 3, 3, 6, 5, 4, 3, 6, 5, 4, 6, 5, 4, 3, 2, 1, 6, 5, 1, 2, 2, 3, 2, 3, 3, 6, 5, 4, 2, 3, 3, 6, 5, 4, 3, 6, 5, 4, 6, 5, 4, 3, 2, 1, 6, 5, 2, 3, 3, 6, 5, 4, 3, 6, 5, 4, 6, 5, 4, 3, 2, 1, 6, 5, 3, 6, 5, 4, 6, 5, 4, 3, 2, 1, 6, 5, 6, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Six-symbol substitution of the bi-Kenyon type.
LINKS
EXAMPLE
Triangle begins:
1,
1, 2,
1, 2, 2, 3,
1, 2, 2, 3, 2, 3, 3, 6, 5, 4,
1, 2, 2, 3, 2, 3, 3, 6, 5, 4, 2, 3, 3, 6, 5, 4, 3, 6, 5, 4, 6, 5, 4, 3, 2, 1, 6, 5,
...
MATHEMATICA
s[n_] := n /. {1 -> 2, 2 -> 3, 3 -> {6, 5, 4}, 4 -> 5, 5 -> 6, 6 -> {3, 2, 1}}; t[a_] := Join[a, Flatten[s /@ a]]; Flatten[ NestList[t, {1}, 5]]
NestList[ Flatten[ Join[ #, # /. {1 -> {2}, 2 ->{3}, 3 ->{6, 5, 4}, 4 ->{5}, 5-> {6}, 6-> {3, 2, 1}} ]] &, {1}, 5] // Flatten (* Robert G. Wilson v, Jun 05 2014 *)
CROSSREFS
Cf. A103684.
Sequence in context: A105062 A106487 A105102 * A178677 A366888 A243924
KEYWORD
nonn,tabf
AUTHOR
Roger L. Bagula, Apr 07 2005
STATUS
approved

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Last modified May 23 18:34 EDT 2024. Contains 372765 sequences. (Running on oeis4.)