110062domain: NAppears in sequencesReal part of g.f. C(x) that satisfies: C(x) = 1 + x*C(I*x)^2.at n=17A193377a(n) = Sum of (Y(2,p)^2) over the partitions p of n, Y(2,p) = number of part sizes with multiplicity 2 or greater in p.at n=37A302347