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A087844 a(n) = a(a(a(min(n-1, abs(n - a(n-1)))))) + a(abs(n - a(n-3))). 2
1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 8, 7, 8, 8, 8, 8, 8, 8, 10, 9, 10, 9, 10, 10, 10, 10, 10, 10, 13, 11, 12, 12, 12, 11, 13, 13, 13, 13, 13, 13, 13, 16, 14, 15, 16, 15, 15, 15, 14, 16, 16, 16, 16, 16, 16, 16, 16, 20, 17, 18, 16, 20, 19, 19, 20, 19, 19, 18, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Muniru A Asiru, Table of n, a(n) for n = 1..10000

MAPLE

a:= proc(n) option remember: if n<4 then 1 else procname(procname(procname(min(n-1, abs(n-procname(n-1))))))+procname(abs(n-procname(n-3))) fi end:

seq(a(n), n=1..100); # Muniru A Asiru, Jun 02 2018

MATHEMATICA

a[n_Integer?Positive] := a[n] = a[ a[a[Min[n-1, Abs[n - a[n-1]]]]]] + a[Abs[n - a[n-3]]]

a[0] = a[1] = a[2] = a[3] = 1

Table[a[n], {n, 1, 200}]

PROG

(GAP) a:=[1, 1, 1];; for n in [4..100] do a[n]:=a[a[a[Minimum(n-1, AbsInt(n-a[n-1]))]]]+a[AbsInt(n-a[n-3])]; od; a; # Muniru A Asiru, Jun 02 2018

CROSSREFS

Cf. A005185, A081831.

Sequence in context: A174901 A308411 A087848 * A287635 A189660 A194167

Adjacent sequences:  A087841 A087842 A087843 * A087845 A087846 A087847

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Oct 07 2003

EXTENSIONS

Edited by N. J. A. Sloane, Jun 16 2007

STATUS

approved

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Last modified January 28 00:32 EST 2020. Contains 331313 sequences. (Running on oeis4.)