10218700800domain: NAppears in sequencesa(n) = (2*n+4)!!/4!!, related to A000165 (even double factorials).at n=9A051578Expansion of e.g.f. x^2*(1-x)/(1-2*x).at n=11A052587Row sums of the FP3 polynomials of A156927.at n=4A156932