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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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6
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1, 2, 3, 5, 5, 8, 13, 13, 13, 26, 13, 91, 13, 106, 106, 75, 93, 62, 80, 132, 337, 416, 62, 62, 62, 271, 34, 155, 525, 548, 1084, 115, 62, 558, 62, 1500, 2922, 124, 2958, 3374, 2323, 4183, 8073, 7925, 744, 2298, 434, 6700, 310, 23796, 12732, 26405
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OFFSET
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1,2
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COMMENTS
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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
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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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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