OFFSET
0,4
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = Sum_{k=0..floor(n/3)} binomial(n - k, k). - Sean A. Irvine, Jun 08 2018
PROG
(PARI) a(n) = sum(k=0, n\3, binomial(n-k, k)); \\ Seiichi Manyama, Feb 10 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved