Expansion of 1 - 3*(1-x-sqrt(1-2*x-3*x^2))/2.

Terms

a(0) =1a(1) =0a(2) =-3a(3) =-3a(4) =-6a(5) =-12a(6) =-27a(7) =-63a(8) =-153a(9) =-381a(10) =-969a(11) =-2505a(12) =-6564a(13) =-17394a(14) =-46533a(15) =-125505a(16) =-340902a(17) =-931716a(18) =-2560401a(19) =-7070337a(20) =-19609146a(21) =-54597852a(22) =-152556057a(23) =-427642677a(24) =-1202289669a(25) =-3389281245a(26) =-9578183391a(27) =-27130207503a(28) =-77009455428a(29) =-219023318406