141094domain: NAppears in sequencesa(n) = sum of the squares of the coefficients of x^n in x^(n-2*k)/A(x^2)^(n-2*k+1), as k varies from 0 to floor(n/2), with a(0)=1, where A(x) is the g.f. of this sequence.at n=18A132455Number of parts in all partitions of 2n that do not contain 1 as a part.at n=23A182734