Expansion of 1/((1-2x)(1-3x)(1-4x)(1-5x)).

Terms

a(0) =1a(1) =14a(2) =125a(3) =910a(4) =5901a(5) =35574a(6) =204205a(7) =1132670a(8) =6129101a(9) =32566534a(10) =170691885a(11) =885423630a(12) =4556561101a(13) =23305343894a(14) =118631189165a(15) =601616805790