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A283896 Relative of Hofstadter Q-sequence: a(-88) = 89, a(-87) = 2; thereafter a(n) = a(n-a(n-1)) + a(n-a(n-2)). 5
91, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180, 2, 180 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

In calculating terms of this sequence, use the convention that a(n)=0 for n<=-89.

Sequences like this are more naturally considered with the first nonzero term in position 1. But this sequence would then begin with 89 terms consisting entirely of alternating 2 and 89.

This sequence has exactly 2467 terms, since a(2467)=0 and computing a(2468) would refer to itself.

LINKS

Nathan Fox, Table of n, a(n) for n = 1..2467

MAPLE

A283896:=proc(n) option remember: if n <= -89 then 0: elif n = -88 then 89: elif n = -87 then 2: else A283896(n-A283896(n-1)) + A283896(n-A283896(n-2)): fi: end:

CROSSREFS

Cf. A005185, A278066, A278067, A278068, A283893, A283894, A283895, A283897.

Sequence in context: A172756 A306304 A175690 * A284439 A119656 A180006

Adjacent sequences:  A283893 A283894 A283895 * A283897 A283898 A283899

KEYWORD

nonn,fini,full

AUTHOR

Nathan Fox, Mar 19 2017

STATUS

approved

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Last modified June 6 14:04 EDT 2020. Contains 334827 sequences. (Running on oeis4.)