Expansion of (1-x)^2/(1-3*x+2*x^3-x^4).

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =29a(5) =80a(6) =224a(7) =624a(8) =1741a(9) =4855a(10) =13541a(11) =37765a(12) =105326a(13) =293751a(14) =819264a(15) =2284905a(16) =6372539a(17) =17772840a(18) =49567974a(19) =138243749a(20) =385558106a(21) =1075311210a(22) =2999014106a(23) =8364169855a(24) =23327445251a(25) =65059618751a(26) =181449530649