For x values see A200656.
For y values see A200657.
Definition: Secondary terms occured when existed such integer k that A200656 is divisible by k^2 and A200657 is divisible by k^3 and A200658 is divisible by k^6.
Terms free of such k are primary terms.
Secondary terms are: a(6)=a(2)*2^6, a(7)=a(3)*2^6.
A200218 is subset of this sequence.