OFFSET
0,2
COMMENTS
Invert transform of A002110.
FORMULA
a(0) = 1; a(n) = Sum_{k=1..n} A002110(k)*a(n-k).
MATHEMATICA
nmax = 19; CoefficientList[Series[1/(1 - Sum[Product[Prime[j], {j, k}] x^k, {k, 1, nmax}]), {x, 0, nmax}], x]
a[0] = 1; a[n_] := a[n] = Sum[Product[Prime[j], {j, k}] a[n - k], {k, 1, n}]; Table[a[n], {n, 0, 19}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 05 2019
STATUS
approved