OFFSET
0,2
FORMULA
a(n) = (3*n-2) * a(n-1) + 1.
PROG
(PARI) a007559(n) = prod(k=1, n, 3*k-2);
a(n) = a007559(n)*sum(k=0, n, 1/a007559(k));
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Jan 05 2024
STATUS
approved