Expansion of (1 -x -sqrt(1-2*x-11*x^2))/(6*x^2).

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =37a(5) =121a(6) =451a(7) =1639a(8) =6259a(9) =23923a(10) =93502a(11) =367852a(12) =1465003a(13) =5874103a(14) =23740276a(15) =96503554a(16) =394542379a(17) =1620716251a(18) =6687296308a(19) =27700303510a(20) =115152607831a(21) =480244735171