Number of divisors of binomial(n, floor(n/2)), the terms of A001405.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =6a(6) =4a(7) =8a(8) =12a(9) =18a(10) =16a(11) =24a(12) =24a(13) =32a(14) =24a(15) =48a(16) =32a(17) =48a(18) =32a(19) =48a(20) =96a(21) =128a(22) =64a(23) =96a(24) =144a(25) =192a(26) =288a(27) =384a(28) =384a(29) =480