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Search: id:A086841
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| A086841 |
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a(n) = a((a(n-2))*mod(n,2)+a(n-1)*(1-mod(n,2))) + a((n - a(n-2))*mod(n,2)+(n-a(n-1))*(1-mod(n,2))). |
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+0
3
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| 1, 1, 2, 2, 3, 4, 4, 4, 5, 6, 7, 7, 8, 8, 8, 8, 9, 10, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 19, 20, 21, 22, 23, 23, 24, 24, 25, 26, 27, 26, 27, 28, 28, 29, 30, 29, 30, 30, 31, 31, 31, 31, 32, 32, 32, 32, 32, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 41, 42
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Let M = A005229, C = A004001. Then we may define a pair of new sequences by o1 = M*mod(n,2)+C*(1-mod(n,2)) (this sequence), o2 = C*mod(n,2)+M*(1-mod(n,2)) (A086525 - or is it A086335?).
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LINKS
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Index entries for Hofstadter-type sequences
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MATHEMATICA
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digits = 200 Mc[n_Integer?Positive] := Mc[n] = Mc[( Mc[n-2])*(Mod[n, 2])+Mc[n-1]*(1-Mod[n, 2])] + Mc[(n - Mc[n-2])*(Mod[n, 2])+(n-Mc[n-1])*(1-Mod[n, 2])] Mc[1] = Mc[2] = 1 a1=Table[Mc[n], {n, 1, digits}]
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CROSSREFS
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Cf. A005229, A086525, A086335. Different from A004001.
Sequence in context: A046699 A102548 A004001 this_sequence A076502 A076897 A078881
Adjacent sequences: A086838 A086839 A086840 this_sequence A086842 A086843 A086844
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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 15 2003
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EXTENSIONS
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Edited by njas, Nov 07 2007
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