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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-6a(4) =24a(5) =3a(6) =-20a(7) =-27a(8) =40a(9) =-2a(10) =-36a(11) =-186a(12) =579a(13) =-118a(14) =274a(15) =-347a(16) =46a(17) =-892a(18) =74a(19) =-76a(20) =3106a(21) =-3192a(22) =-1013a(23) =-4844a(24) =12276a(25) =-752a(26) =2145a(27) =-656a(28) =11198a(29) =-11160