a(n) = n(n+1)(n+2)...(n+8) / (n+(n+1)+(n+2)+...+(n+8)).

Terms

a(0) =0a(1) =8064a(2) =67200a(3) =316800a(4) =1108800a(5) =3203200a(6) =8072064a(7) =18345600a(8) =38438400a(9) =75398400a(10) =140025600a(11) =248312064a(12) =423259200a(13) =697132800a(14) =1114220800a(15) =1734163200a(16) =2635928064a(17) =3922512000a(18) =5726448000a(19) =8216208000a(20) =11603592000a(21) =16152200064a(22) =22187088000a(23) =30105712000a(24) =40390272000