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

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =12a(5) =87a(6) =494a(7) =2421a(8) =10752a(9) =44515a(10) =174930a(11) =660465a(12) =2416580a(13) =8622879a(14) =30147798a(15) =103653613a(16) =351451656a(17) =1177793499a(18) =3908152538a(19) =12858800745a(20) =42001844940a(21) =136331670295a(22) =440083517790