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

Terms

a(0) =1a(1) =11a(2) =19a(3) =71a(4) =41a(5) =209a(6) =71a(7) =367a(8) =226a(9) =451a(10) =155a(11) =1349a(12) =209a(13) =781a(14) =779a(15) =1695a(16) =341a(17) =2486a(18) =419a(19) =2911a(20) =1349a(21) =1705a(22) =599a(23) =6973a(24) =1166a(25) =2299a(26) =2278a(27) =5041a(28) =929a(29) =8569