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A087839 a[n] =a[a[a[a[a[n-2]]]]]+ a[n - a[n-2]]. 1
1, 1, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A fifth order recursion based on Colin Mallows's sequence A005229.

Differs from A106742 at n = 233 where this is 23 whereas A106742(233) = 22. - Joshua Zucker, May 17 2007

LINKS

Table of n, a(n) for n=1..85.

MATHEMATICA

Mallows[n_Integer?Positive] := Mallows[n] = Mallows[Mallows[Mallows[Mallows[Mallows[n-2]]]]]+ Mallows[n - Mallows[n-2]] Mallows[1] = Mallows[2] = 1 digits=200 a=Table[Mallows[n], {n, 1, digits}]

CROSSREFS

Cf. A004001, A005229, A106742.

Sequence in context: A130241 A130247 A209869 * A106742 A106733 A087838

Adjacent sequences:  A087836 A087837 A087838 * A087840 A087841 A087842

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Oct 07 2003

EXTENSIONS

Edited by N. J. A. Sloane, Jun 15 2007

STATUS

approved

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Last modified December 10 12:43 EST 2019. Contains 329896 sequences. (Running on oeis4.)