Expansion of g.f.: (1-5*x)/((1-6*x)*(1-x)^2).

Terms

a(0) =1a(1) =3a(2) =11a(3) =55a(4) =315a(5) =1871a(6) =11203a(7) =67191a(8) =403115a(9) =2418655a(10) =14511891a(11) =87071303a(12) =522427771a(13) =3134566575a(14) =18807399395a(15) =112844396311a(16) =677066377803