OFFSET
1,3
COMMENTS
See FORMULA for definition.
REFERENCES
S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 129.
LINKS
Martin Møller Skarbiniks Pedersen, Table of n, a(n) for n = 1..10000
J. Grytczuk, Another variation on Conway's recursive sequence, Discr. Math. 282 (2004), 149-161.
Martin Møller Skarbiniks Pedersen, Plot of first 100000000 values (pdf)
Martin Møller Skarbiniks Pedersen, Plot of a(n)/n for the first 100000000 values (pdf)
Martin Møller Skarbiniks Pedersen, Plot of a(n) for the first 100,000,000 values (png)
Martin Møller Skarbiniks Pedersen, Plot of a(n)/n for the first 100000000 values (png)
K. Pinn, A chaotic cousin of Conway's recursive sequence, Experimental Mathematics, 9:1 (2000), 55-65.
FORMULA
a(1) = 1, a(2) = 1, a(n) = a(a(n-1)) + a(n - a(n-2) - 1) for n >= 3. [Jaroslav Krizek, Dec 09 2009]
MAPLE
MATHEMATICA
a[n_] := a[n] = If[n < 3, 1, a[a[n - 1]] + a[n - a[n - 2] - 1]]; Array[a, 70] (* Michael De Vlieger, Mar 29 2017 *)
CROSSREFS
KEYWORD
nonn,look
AUTHOR
N. J. A. Sloane, Jul 13 2000
STATUS
approved