Numerator of (3/4)^n * binomial(2*n,n).

Terms

a(0) =1a(1) =3a(2) =27a(3) =135a(4) =2835a(5) =15309a(6) =168399a(7) =938223a(8) =42220035a(9) =239246865a(10) =2727414261a(11) =15620645313a(12) =359274842199