Expansion of 1/(1-4*x)^(9/2).

Terms

a(0) =1a(1) =18a(2) =198a(3) =1716a(4) =12870a(5) =87516a(6) =554268a(7) =3325608a(8) =19122246a(9) =106234700a(10) =573667380a(11) =3024791640a(12) =15628090140a(13) =79342611480a(14) =396713057400