Expansion of (1-4*x)^(21/2).

Terms

a(0) =1a(1) =-42a(2) =798a(3) =-9044a(4) =67830a(5) =-352716a(6) =1293292a(7) =-3325608a(8) =5819814a(9) =-6466460a(10) =3879876a(11) =-705432a(12) =-117572a(13) =-54264a(14) =-38760a(15) =-36176a(16) =-40698a(17) =-52668a(18) =-76076a(19) =-120120a(20) =-204204a(21) =-369512a(22) =-705432a(23) =-1410864a(24) =-2939300a(25) =-6348888a(26) =-14162904a(27) =-32522224a(28) =-76659528a(29) =-185040240