a(0) = 1, a(n) = 480*sigma_7(n).

Terms

a(0) =1a(1) =480a(2) =61920a(3) =1050240a(4) =7926240a(5) =37500480a(6) =135480960a(7) =395301120a(8) =1014559200a(9) =2296875360a(10) =4837561920a(11) =9353842560a(12) =17342613120a(13) =30119288640a(14) =50993844480a(15) =82051050240a(16) =129863578080a(17) =196962563520