OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..10000

MATHEMATICA

a[n_]:= a[n]= If[n<2, n, 1 +a[n-a[n-1]] +Mod[n-a[n-1], 3] -Mod[n-a[n-2], 3]];

Table[a[n], {n, 0, 100}]

PROG

(Magma) [n le 2 select n-1 else 1 + Self(n-Self(n-1)) - ((n+2-Self(n-1)) mod 3) + ((n+3-Self(n-2)) mod 4) : n in [1..101]]; // G. C. Greubel, Mar 30 2024

(SageMath)

@CachedFunction

def a(n): # a = A110898

if n<2: return n

else: return 1 +a(n-a(n-1)) -(n-a(n-1))%3 +(n-a(n-2))%4

[a(n) for n in range(101)] # G. C. Greubel, Mar 30 2024

CROSSREFS

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, Sep 20 2005

EXTENSIONS

Edited by G. C. Greubel, Mar 30 2024

STATUS

approved