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

Terms

a(0) =1a(1) =4a(2) =16a(3) =64a(4) =253a(5) =1000a(6) =3952a(7) =15616a(8) =61705a(9) =243820a(10) =963424a(11) =3806848a(12) =15042277a(13) =59437648a(14) =234860320a(15) =928020736a(16) =3666956113a(17) =14489511508a(18) =57253465072a(19) =226229798080a(20) =893918323981