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A086335 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. 4
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; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A Batrachian sequence that switches between Conway's and Hofstadter's sequences modulo 2.

LINKS

Table of n, a(n) for n=1..74.

MATHEMATICA

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 }]

CROSSREFS

Cf. A004001, A005185. Complement gives A086451.

Sequence in context: A020888 A196393 A274089 * A123387 A123070 A057361

Adjacent sequences:  A086332 A086333 A086334 * A086336 A086337 A086338

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Sep 01 2003

EXTENSIONS

Edited by N. J. A. Sloane, May 25 2006

STATUS

approved

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Last modified July 23 22:49 EDT 2019. Contains 325278 sequences. (Running on oeis4.)