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

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =17a(5) =42a(6) =100a(7) =235a(8) =561a(9) =1331a(10) =3158a(11) =7503a(12) =17812a(13) =42292a(14) =100425a(15) =238445a(16) =566171a(17) =1344336a(18) =3192013a(19) =7579198a(20) =17996232a(21) =42730667a(22) =101460725a(23) =240910755a(24) =572024206a(25) =1358227891a(26) =3225008568a(27) =7657536968a(28) =18182237777a(29) =43172337417