Sum of the elements of the difference triangle of the divisors of n (including the divisors of n).

Terms

a(0) =1a(1) =4a(2) =6a(3) =11a(4) =10a(5) =21a(6) =14a(7) =26a(8) =25a(9) =31a(10) =22a(11) =52a(12) =26a(13) =41a(14) =54a(15) =57a(16) =34a(17) =86a(18) =38a(19) =66a(20) =72a(21) =61a(22) =46a(23) =103a(24) =71a(25) =71a(26) =90a(27) =102a(28) =58a(29) =205