Expansion of Product_{k>=1} 1 / (1 - x^k)^binomial(2*k,k).

Terms

a(0) =1a(1) =2a(2) =9a(3) =36a(4) =154a(5) =644a(6) =2744a(7) =11608a(8) =49267a(9) =208610a(10) =882963a(11) =3731640a(12) =15754327a(13) =66426946a(14) =279766063a(15) =1176920484a(16) =4945739292a(17) =20761707824a(18) =87069433162a(19) =364802647912