a(n) = tau( sigma_n(n) ), where tau is the number of divisors of n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =8a(5) =24a(6) =16a(7) =4a(8) =8a(9) =72a(10) =96a(11) =256a(12) =32a(13) =64a(14) =1728a(15) =64a(16) =12a(17) =384a(18) =48a(19) =2048a(20) =3456a(21) =128a(22) =512a(23) =2304a(24) =256a(25) =384a(26) =2048a(27) =9216a(28) =128a(29) =69120