Expansion of x^2/(1 -2*x -121*x^2).

Terms

a(0) =0a(1) =1a(2) =2a(3) =125a(4) =492a(5) =16109a(6) =91750a(7) =2132689a(8) =15367128a(9) =288789625a(10) =2437001738a(11) =39817548101a(12) =374512306500