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

Terms

a(0) =1a(1) =3a(2) =8a(3) =21a(4) =54a(5) =138a(6) =352a(7) =897a(8) =2285a(9) =5820a(10) =14823a(11) =37752a(12) =96148a(13) =244872a(14) =623645a(15) =1588311a(16) =4045140a(17) =10302237a(18) =26237926a(19) =66823230a(20) =170186624a(21) =433434405a(22) =1103878665a(23) =2811378360a(24) =7160069791a(25) =18235396608a(26) =46442241368a(27) =118279949136a(28) =301237536249a(29) =767197263003