Difference between product of divisors of n and sum of divisors of n.

Terms

a(0) =0a(1) =-1a(2) =-1a(3) =1a(4) =-1a(5) =24a(6) =-1a(7) =49a(8) =14a(9) =82a(10) =-1a(11) =1700a(12) =-1a(13) =172a(14) =201a(15) =993a(16) =-1a(17) =5793a(18) =-1a(19) =7958a(20) =409a(21) =448a(22) =-1a(23) =331716a(24) =94a(25) =634a(26) =689a(27) =21896a(28) =-1a(29) =809928