Expansion of x/(1 - 3*x - 6*x^2).

Terms

a(0) =0a(1) =1a(2) =3a(3) =15a(4) =63a(5) =279a(6) =1215a(7) =5319a(8) =23247a(9) =101655a(10) =444447a(11) =1943271a(12) =8496495a(13) =37149111a(14) =162426303a(15) =710173575a(16) =3105078543a(17) =13576277079a(18) =59359302495a(19) =259535569959