A087839 a(n) = a(a(a(a(a(n-2))))) + a(n - a(n-2)).

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

Offset

1,3

Comments

A fifth-order recursion based on 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

a[n_Integer?Positive] := a[n] = a[a[a[a[a[n-2]]]]]+ a[n - a[n-2]]
a[1] = a[2] = 1
Table[a[n], {n, 1, 100}]

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