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 A087838 a[n] =a[a[a[a[n-2]]]]+ a[n - a[n-2]] 0
 1, 1, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A fourth-order recursion based on Mallows's A005229. LINKS MATHEMATICA Mallows[n_Integer?Positive] := Mallows[n] = 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. A005229. Sequence in context: A087839 A106742 A106733 * A057627 A013940 A029129 Adjacent sequences:  A087835 A087836 A087837 * A087839 A087840 A087841 KEYWORD nonn AUTHOR Roger L. Bagula, Oct 07 2003 STATUS approved

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Last modified December 16 06:18 EST 2019. Contains 330016 sequences. (Running on oeis4.)