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

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =7a(6) =16a(7) =41a(8) =105a(9) =274a(10) =715a(11) =1871a(12) =4896a(13) =12817a(14) =33553a(15) =87842a(16) =229971a(17) =602071a(18) =1576240a(19) =4126649a(20) =10803705a(21) =28284466a(22) =74049691a(23) =193864607a(24) =507544128a(25) =1328767777a(26) =3478759201a(27) =9107509826a(28) =23843770275a(29) =62423800999