Expansion of 1/((1-3x)(1-6x)(1-7x)).

Terms

a(0) =1a(1) =16a(2) =175a(3) =1630a(4) =13921a(5) =112756a(6) =881875a(7) =6730810a(8) =50468341a(9) =373414096a(10) =2734771975a(11) =19868820790a(12) =143434778761