Expansion of e.g.f. cos( 2 * log(1+x) ).

Terms

a(0) =1a(1) =0a(2) =-4a(3) =12a(4) =-28a(5) =40a(6) =200a(7) =-3360a(8) =35680a(9) =-357120a(10) =3644800a(11) =-38896000a(12) =437756800a(13) =-5206406400a(14) =65372153600a(15) =-864339840000