153180domain: NAppears in sequencesa(n) = n!^2 times coefficient of x^n in e^(x*(3-x)/2/(1-x))/(1-x)^(1/2).at n=5A073178a(n) = 3*n^3 + n^2 - 4*n.at n=37A083127G.f.: Product_{n=-oo..+oo} ( 1 + x^n*(1 - x^n)^n ).at n=46A293602Number of transitive relations on an n-set with exactly two ordered pairs.at n=24A349919