Number of divisors of n!! (double factorial = A006882(n)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =4a(6) =10a(7) =8a(8) =16a(9) =16a(10) =36a(11) =32a(12) =66a(13) =64a(14) =144a(15) =120a(16) =192a(17) =240a(18) =340a(19) =480a(20) =570a(21) =864a(22) =1200a(23) =1728a(24) =1656a(25) =2880a(26) =3456a(27) =4320a(28) =5616a(29) =8640