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Search: id:A086335
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| A086335 |
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a[n] = a[(n - a[n-1])*(1-mod[n, 2])+a[n-1]*(mod[n, 2])] + a[(n - a[n-2])*(1-mod[n, 2]) +(n-a[n-1])*(mod[n, 2 ])] with a[1] = a[2] = 1. |
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+0
5
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| 1, 1, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 9, 8, 10, 9, 11, 11, 12, 11, 13, 13, 15, 13, 16, 15, 17, 16, 18, 15, 19, 20, 20, 16, 21, 21, 22, 20, 23, 22, 25, 22, 26, 24, 26, 24, 28, 24, 29, 28, 31, 26, 32, 29, 33, 32, 36, 28, 35, 36, 37, 31, 39, 36, 39, 32, 41, 38, 39, 39, 43, 38, 41, 41
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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A Batrachian sequence that switches between Conway's and Hofstadter's sequences modulo 2.
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MATHEMATICA
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Hc[n_Integer?Positive] := Hc[n] =Hc[(n - Hc[n-1])*(1-Mod[n, 2])+Hc[n-1]*(Mod[n, 2])] + Hc[(n - Hc[n-2])*(1-Mod[n, 2])+(n-Hc[n-1])*(Mod[n, 2])] Hc[1] = Hc[2] = 1 Terms =202 a=Table[Hc[n], {n, 1, Terms }]
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CROSSREFS
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Cf. A004001, A005185. Complement gives A086451.
Adjacent sequences: A086332 A086333 A086334 this_sequence A086336 A086337 A086338
Sequence in context: A047785 A027923 A020888 this_sequence A123387 A123070 A057361
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Sep 01 2003
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EXTENSIONS
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Edited by njas, May 25 2006
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