Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.

Terms

a(0) =1a(1) =10a(2) =26a(3) =75a(4) =111a(5) =255a(6) =319a(7) =544a(8) =713a(9) =1037a(10) =1181a(11) =1965a(12) =2161a(13) =2737a(14) =3313a(15) =4274a(16) =4598a(17) =6119a(18) =6519a(19) =8283a(20) =9307a(21) =10603a(22) =11179a(23) =14779a(24) =15740a(25) =17504a(26) =19104a(27) =22240a(28) =23140a(29) =28324