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

Terms

a(0) =1a(1) =3a(2) =10a(3) =32a(4) =103a(5) =331a(6) =1064a(7) =3420a(8) =10993a(9) =35335a(10) =113578a(11) =365076a(12) =1173471a(13) =3771911a(14) =12124128a(15) =38970824a(16) =125264689a(17) =402640763a(18) =1294216154a(19) =4160024536a(20) =13371648999a(21) =42980755379a(22) =138153890600a(23) =444070778180