Expansion of x/((1-x)(1-4x^2)(1-5x)).

Terms

a(0) =1a(1) =6a(2) =35a(3) =180a(4) =921a(5) =4626a(6) =23215a(7) =116160a(8) =581141a(9) =2906046a(10) =14531595a(11) =72659340a(12) =363302161a(13) =1816516266a(14) =9082603175a(15) =45413037720a(16) =227065275981