OFFSET
0,3
FORMULA
G.f.: A(x) = 1/Product_{i>=1, j>=0} (1 - x^(i * 7^j)).
Let A(x) be the g.f. of this sequence, and P(x) be the g.f. of A000041, then P(x) = A(x)/A(x^7).
PROG
(PARI) my(N=50, x='x+O('x^N)); Vec(1/prod(k=1, N, (1-x^k)^(valuation(k, 7)+1)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 31 2024
STATUS
approved