Expansion of x^6/((1 - x)^2*(1 - 2*x + x^3 - x^4)).

Terms

a(0) =1a(1) =4a(2) =11a(3) =25a(4) =52a(5) =103a(6) =199a(7) =379a(8) =716a(9) =1346a(10) =2523a(11) =4721a(12) =8825a(13) =16487a(14) =30791a(15) =57494a(16) =107343a(17) =200400a(18) =374116a(19) =698403a(20) =1303770a(21) =2433846a(22) =4543428a(23) =8481513a(24) =15832975a(25) =29556394a(26) =55174730a(27) =102998026a(28) =192272662a(29) =358927018