a(n) = sigma_1(n) * sigma_2(n).

Terms

a(0) =1a(1) =15a(2) =40a(3) =147a(4) =156a(5) =600a(6) =400a(7) =1275a(8) =1183a(9) =2340a(10) =1464a(11) =5880a(12) =2380a(13) =6000a(14) =6240a(15) =10571a(16) =5220a(17) =17745a(18) =7240a(19) =22932a(20) =16000a(21) =21960a(22) =12720a(23) =51000a(24) =20181a(25) =35700a(26) =32800a(27) =58800a(28) =25260a(29) =93600