OFFSET
1,7
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..1000
PROG
(PARI) a(n) = my(p = prime(n)); polcoef((4-x^3)/(1-x^3-x^4) + O(x^(p+1)), p)/p; \\ Michel Marcus, Mar 04 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Christian G. Bower, Dec 23 1999
EXTENSIONS
Corrected by Seiichi Manyama, Mar 04 2019
STATUS
approved