a(n) = Sum_{d|n} d^(1 + 2*n/d).

Terms

a(0) =1a(1) =9a(2) =28a(3) =97a(4) =126a(5) =588a(6) =344a(7) =2049a(8) =2917a(9) =6174a(10) =1332a(11) =53764a(12) =2198a(13) =52320a(14) =258648a(15) =430081a(16) =4914a(17) =2463429a(18) =6860a(19) =8352582a(20) =15181712a(21) =8560308a(22) =12168a(23) =242240964a(24) =48843751a(25) =134606598a(26) =1167064120a(27) =1651526120a(28) =24390a(29) =14202123408