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

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =13a(5) =102a(6) =626a(7) =3311a(8) =15843a(9) =70540a(10) =297520a(11) =1203165a(12) =4705145a(13) =17905154a(14) =66617502a(15) =243210523a(16) =873775999a(17) =3096218184a(18) =10841220092a(19) =37566155945a(20) =128982711285a(21) =439276114270