Expansion of Sum_{k>=0} (-1)^k * x^(2*k)/Product_{j=1..k} (1 - j * x).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =0a(5) =2a(6) =5a(7) =8a(8) =6a(9) =-18a(10) =-111a(11) =-377a(12) =-953a(13) =-1567a(14) =964a(15) =23411a(16) =133702a(17) =554185a(18) =1801323a(19) =3910514a(20) =-2415952a(21) =-92788743a(22) =-700128734a(23) =-3842587204a(24) =-17042883146a(25) =-57693979779a(26) =-86308109341a(27) =779904767601