Expansion of 1/((1-x) * (1-4*x) * (1-7*x)).

Terms

a(0) =1a(1) =12a(2) =105a(3) =820a(4) =6081a(5) =43932a(6) =312985a(7) =2212740a(8) =15576561a(9) =109385452a(10) =767096265a(11) =5375266260a(12) =37649233441a(13) =263634112572