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

Terms

a(0) =1a(1) =7a(2) =19a(3) =47a(4) =76a(5) =151a(6) =197a(7) =335a(8) =424a(9) =632a(10) =727a(11) =1127a(12) =1184a(13) =1673a(14) =1894a(15) =2511a(16) =2602a(17) =3634a(18) =3611a(19) =4872a(20) =5066a(21) =6299a(22) =6349a(23) =8615a(24) =8201a(25) =10316a(26) =10630a(27) =13081a(28) =12616a(29) =16526