Numerator of n * Product_{d|n} (1 + 1/d).

Terms

a(0) =2a(1) =6a(2) =8a(3) =15a(4) =12a(5) =28a(6) =16a(7) =135a(8) =80a(9) =198a(10) =24a(11) =455a(12) =28a(13) =360a(14) =256a(15) =2295a(16) =36a(17) =2660a(18) =40a(19) =2079a(20) =1408a(21) =828a(22) =48a(23) =11375a(24) =312a(25) =1134a(26) =2240a(27) =6525a(28) =60a(29) =76384