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

Terms

a(0) =1a(1) =3a(2) =11a(3) =42a(4) =157a(5) =588a(6) =2204a(7) =8259a(8) =30949a(9) =115977a(10) =434606a(11) =1628619a(12) =6103000a(13) =22870056a(14) =85702025a(15) =321155187a(16) =1203479779a(17) =4509855786a(18) =16899992477a(19) =63330128340a(20) =237319937332a(21) =889320046107