Expansion of 2*x*(1 + x)/(1 - x - 9*x^2 + x^3).

Terms

a(0) =0a(1) =2a(2) =4a(3) =22a(4) =56a(5) =250a(6) =732a(7) =2926a(8) =9264a(9) =34866a(10) =115316a(11) =419846a(12) =1422824a(13) =5086122a(14) =17471692a(15) =61823966a(16) =213983072a(17) =752927074a(18) =2616950756a(19) =9179311350a(20) =31978941080a(21) =111975792474a(22) =390606950844