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

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =17a(5) =28a(6) =43a(7) =62a(8) =86a(9) =115a(10) =150a(11) =191a(12) =239a(13) =294a(14) =357a(15) =428a(16) =508a(17) =597a(18) =696a(19) =805a(20) =925a(21) =1056a(22) =1199a(23) =1354a(24) =1522a(25) =1703a(26) =1898a(27) =2107a(28) =2331a(29) =2570