G.f.: Product_{m>0} (1 - x^m + 2!*x^(2*m) - 3!*x^(3*m) + 4!*x^(4*m) - 5!*x^(5*m)).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-6a(4) =24a(5) =-117a(6) =-20a(7) =93a(8) =160a(9) =-122a(10) =-156a(11) =414a(12) =459a(13) =-2038a(14) =-2486a(15) =13333a(16) =1246a(17) =2468a(18) =-8446a(19) =-13036a(20) =-4814a(21) =7848a(22) =-11453a(23) =50116a(24) =-46764a(25) =-1952a(26) =-164895a(27) =214144a(28) =249038a(29) =396600