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

Terms

a(0) =1a(1) =6a(2) =25a(3) =90a(4) =300a(5) =954a(6) =2939a(7) =8850a(8) =26195a(9) =76500a(10) =221016a(11) =632916a(12) =1799125a(13) =5082270a(14) =14279725a(15) =39935214a(16) =111228804a(17) =308681550a(18) =853904015a(19) =2355364650a(20) =6480104231a(21) =17786356776a(22) =48715278000a(23) =133167004200a(24) =363372003625a(25) =989900286774