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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-6a(4) =0a(5) =3a(6) =4a(7) =-3a(8) =-8a(9) =22a(10) =12a(11) =6a(12) =3a(13) =-22a(14) =-62a(15) =61a(16) =-2a(17) =68a(18) =-166a(19) =68a(20) =-14a(21) =-216a(22) =-53a(23) =196a(24) =-12a(25) =304a(26) =-15a(27) =-32a(28) =-322a(29) =24