A285578 a(1) = a(3) = a(4) = 2, a(2) = 1; a(n) = a(a(n-2)) + a(n-a(n-4)-2) for n > 4.

2, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 7, 7, 8, 8, 8, 8, 8, 9, 9, 10, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17, 18, 19, 19, 20, 20, 21, 21, 21, 22, 22, 23, 24, 25, 27, 27, 28, 28, 28, 29, 29, 30, 31, 31, 32, 32, 32, 32, 32, 32, 32, 32, 32, 33, 33, 34, 35

Offset

1,1

Links

Altug Alkan, Table of n, a(n) for n = 1..10000

Altug Alkan, Plot for first differences

Mathematica

a[1] = a[3] = a[4] = 2; a[2] = 1; a[n_] := a[n] = a[a[n - 2]] + a[n - a[n - 4] - 2]; Array[a, 75] (* Michael De Vlieger, Apr 24 2017 *)

Prog

(PARI) q=vector(10000); q[1]=q[3]=q[4]=2; q[2]=1; for(n=5, #q, q[n]=q[q[n-2]]+q[n-q[n-4]-2]); vector(10000, n, q[n])

Crossrefs

Cf. A005185, A055748.

Sequence in context: A224931 A029195 A242745 * A029168 A035454 A161228

Adjacent sequences: A285575 A285576 A285577 * A285579 A285580 A285581

Keyword

nonn

Author

Altug Alkan, Apr 22 2017

Status

approved