Expansion of e.g.f. x^2/((1-x)^2*(1+x)).

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =48a(5) =240a(6) =2160a(7) =15120a(8) =161280a(9) =1451520a(10) =18144000a(11) =199584000a(12) =2874009600a(13) =37362124800a(14) =610248038400