Numerators in expansion of exp(2x)/(1-x).

Terms

a(0) =1a(1) =3a(2) =5a(3) =19a(4) =7a(5) =109a(6) =331a(7) =155a(8) =2327a(9) =20947a(10) =34913a(11) =164591a(12) =691283a(13) =14977801a(14) =314533829a(15) =4718007451a(16) =1572669151a(17) =16041225341a(18) =103122162907