a(n) = n^7 * Sum_{p|n, p prime} 1/p^7.

Terms

a(0) =0a(1) =1a(2) =1a(3) =128a(4) =1a(5) =2315a(6) =1a(7) =16384a(8) =2187a(9) =78253a(10) =1a(11) =296320a(12) =1a(13) =823671a(14) =80312a(15) =2097152a(16) =1a(17) =5062905a(18) =1a(19) =10016384a(20) =825730a(21) =19487299a(22) =1a(23) =37928960a(24) =78125a(25) =62748645a(26) =4782969a(27) =105429888a(28) =1a(29) =181139311