Coefficients of the solution to a functional equation.

Terms

a(0) =1a(1) =-2a(2) =-2a(3) =-16a(4) =14a(5) =64a(6) =-484a(7) =-2048a(8) =3798a(9) =-7168a(10) =96292a(11) =131072a(12) =-1247476a(13) =3964928a(14) =-27170632a(15) =-67108864a(16) =220816742a(17) =-497811456a(18) =993377620a(19) =-3758096384a(20) =38457826404a(21) =-201938960384