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

Terms

a(0) =1a(1) =3a(2) =8a(3) =24a(4) =69a(5) =202a(6) =587a(7) =1711a(8) =4981a(9) =14508a(10) =42248a(11) =123039a(12) =358314a(13) =1043497a(14) =3038897a(15) =8849971a(16) =25773136a(17) =75057288a(18) =218584013a(19) =636566754a(20) =1853828259a(21) =5398772767a(22) =15722463557a(23) =45787417156a(24) =133343452216a(25) =388326692343