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

Terms

a(0) =1a(1) =1a(2) =4a(3) =0a(4) =36a(5) =-60a(6) =1920a(7) =-1680a(8) =109200a(9) =-347760a(10) =9858240a(11) =-27941760a(12) =1321911360a(13) =-3675672000a(14) =210819248640a(15) =-422918496000a(17) =432259027200