a(n) = Sum_{j=1..n} Sum_{k=1..n} tau(j*k).

Terms

a(0) =1a(1) =8a(2) =23a(3) =54a(4) =89a(5) =162a(6) =221a(7) =326a(8) =439a(9) =596a(10) =707a(11) =964a(12) =1107a(13) =1352a(14) =1645a(15) =1976a(16) =2179a(17) =2630a(18) =2865a(19) =3390a(20) =3859a(21) =4316a(22) =4615a(23) =5406a(24) =5883a(25) =6444a(26) =7059a(27) =7892a(28) =8299a(29) =9430