OFFSET
1,1
COMMENTS
In the definition one can take y=1. Thus the sequence becomes the number of terms in the polynomial of the product{k=0..n} (1-x^p_i), where p_i is the i-th prime and p_0 = 1.
Offset is 1 to keep it parallel to other like sequences.
MATHEMATICA
f[n_] := Length@ ExpandAll[(1 - x) Product[(1 - x^Prime[k]), {k, n}]]; Array[f, 51, 0]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, May 12 2013
STATUS
approved