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A006447
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Consider a 2-D cellular automaton generated by the Schrandt-Ulam rule of A170896, but confined to a semi-infinite strip of width n, starting with one ON cell at the top left corner; a(n) is the period of the resulting structure.
(Formerly M0608)
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0
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1, 2, 3, 5, 5, 8, 13, 13, 13, 26, 13, 91, 13, 106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Schrandt and Ulam remark that there seems to be no simple relation between n and a(n).
The original report included two further terms, but they were omitted from the published version, so are presumably unreliable.
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REFERENCES
| R. G. Schrandt and S. M. Ulam, ``On recursively defined geometric objects and patterns of growth,'' Los Alamos Scientific Laboratory, Report LA-3762, Aug 16 1967; published in A. W. Burks, editor, Essays on Cellular Automata. Univ. Ill. Press, 1970, pp. 238ff.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| R. G. Schrandt and S. M. Ulam, On recursively defined geometric objects and patterns of growth [Link supplied by Laurinda J. Alcorn, Jan 09 2010.]
Index entries for sequences related to cellular automata
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CROSSREFS
| Sequence in context: A194939 A135635 A204207 * A014237 A033885 A053079
Adjacent sequences: A006444 A006445 A006446 * A006448 A006449 A006450
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KEYWORD
| nonn,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Entry revised by N. J. A. Sloane (njas(AT)research.att.com), Jan 09 2010
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