Expansion of x^2/((1-x)*(1+2*x)*(1-6*x)).

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =33a(5) =193a(6) =1169a(7) =6993a(8) =42001a(9) =251921a(10) =1511697a(11) =9069841a(12) =54419729a(13) =326517009a(14) =1959104785a(15) =11754623249a(16) =70527750417a(17) =423166480657