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

Terms

a(0) =1a(1) =10a(2) =17a(3) =59a(4) =37a(5) =170a(6) =65a(7) =284a(8) =186a(9) =370a(10) =145a(11) =1003a(12) =197a(13) =650a(14) =629a(15) =1245a(16) =325a(17) =1860a(18) =401a(19) =2183a(20) =1105a(21) =1450a(22) =577a(23) =4828a(24) =998a(25) =1970a(26) =1786a(27) =3835a(28) =901a(29) =6290