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
KEYWORD
nonn
AUTHOR
Altug Alkan, Apr 22 2017
STATUS
approved