a(n) = [x^n] x/((1 - x)*(1 - 4*x)^(5/2)).

Terms

a(0) =0a(1) =1a(2) =11a(3) =81a(4) =501a(5) =2811a(6) =14823a(7) =74883a(8) =366603a(9) =1752273a(10) =8218733a(11) =37964449a(12) =173172249a(13) =781607349a(14) =3496163949a(15) =15517771749a(16) =68412846069a(17) =299828796219