Expansion of 1/((1-x)*(1+3*x)*(1-4*x)).

Terms

a(0) =1a(1) =2a(2) =15a(3) =40a(4) =221a(5) =702a(6) =3355a(7) =11780a(8) =52041a(9) =193402a(10) =817895a(11) =3138720a(12) =12953461a(13) =50618102a(14) =206059635a(15) =813476860a(16) =3286192481a(17) =13047914802a(18) =52482224575a(19) =209057202200a(20) =838843897101