OFFSET
0,5
FORMULA
a(n) = Sum_{k=0..floor(n/3)} 8^k * binomial((n+k)/4-1,k).
PROG
(PARI) a(n) = sum(k=0, n\3, 8^k*binomial((n+k)/4-1, k));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 07 2024
STATUS
approved