E.g.f.: exp((1-x)*(1-x^2)*(1-x^3) - 1).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =5a(4) =25a(5) =-41a(6) =-1769a(7) =7181a(8) =74705a(9) =-236305a(10) =-7562609a(11) =-4169771a(12) =1339186729a(13) =-2144219065a(14) =-174083994265a(15) =-370106105251