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A092400
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Fixed point of the morphism 1 -> 1121211, 2 -> 1121212121211, starting from a(1) = 1.
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1
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1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1
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OFFSET
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1,3
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COMMENTS
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Length of n-th run of identical symbols in A051069.
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LINKS
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Table of n, a(n) for n=1..105.
Index entries for sequences that are fixed points of mappings
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FORMULA
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Sum_{k=1..n} a(k) = A007417(n).
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MATHEMATICA
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Nest[ Function[ l, {Flatten[(l /. {1 -> {1, 1, 2, 1, 2, 1, 1}, 2 -> {1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1}})]}], {1}, 3] (* Robert G. Wilson v, Feb 26 2005 *)
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CROSSREFS
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Cf. A007417, A051069.
Sequence in context: A184240 A244840 A103414 * A303598 A337277 A269974
Adjacent sequences: A092397 A092398 A092399 * A092401 A092402 A092403
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KEYWORD
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easy,nonn
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AUTHOR
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Philippe Deléham, Mar 21 2004
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EXTENSIONS
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More terms from Robert G. Wilson v, Feb 26 2005
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STATUS
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approved
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