id:A108121 - OEIS Search Results

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A three-symbol substitution sequence with characteristic polynomial: x^3-x^2-2*x-1.

+0
1

3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2, 2, 3, 3, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 1, 2 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`This substitution is unique in that it gives a two part tile that only tiles aperiodically.`
	FORMULA	`1->{2}, 2->{3}, 3->{1, 2, 2, 3}`
	MATHEMATICA	`s[1] = {2}; s[2] = {3}; s[3] = {1, 2, 2, 3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[8]`
	CROSSREFS	`Sequence in context: A029418 A085247 A003016 this_sequence A072548 A079399 A092155` `Adjacent sequences: A108118 A108119 A108120 this_sequence A108122 A108123 A108124`
	KEYWORD	`nonn,uned`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 04 2005`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

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