Generalized sum of divisors function: third diagonal of A060047.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =24a(6) =40a(7) =56a(8) =84a(9) =122a(10) =168a(11) =232a(12) =312a(13) =408a(14) =528a(15) =672a(16) =865a(17) =1078a(18) =1336a(19) =1648a(20) =2002a(21) =2424a(22) =2912a(23) =3472a(24) =4116a(25) =4872a(26) =5744a(27) =6648a(28) =7752a(29) =8976