Let a,b,c,...k be all divisors of n; a(n) = (a+1)*(b+1)*...*(k+1).

Terms

a(0) =2a(1) =6a(2) =8a(3) =30a(4) =12a(5) =168a(6) =16a(7) =270a(8) =80a(9) =396a(10) =24a(11) =10920a(12) =28a(13) =720a(14) =768a(15) =4590a(16) =36a(17) =31920a(18) =40a(19) =41580a(20) =1408a(21) =1656a(22) =48a(23) =2457000a(24) =312a(25) =2268a(26) =2240a(27) =104400a(28) =60a(29) =5499648