Number of positive divisors of hyperfactorial(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =44a(5) =264a(6) =1020a(7) =8160a(8) =19680a(9) =55104a(10) =182784a(11) =2193408a(12) =4608000a(13) =64512000a(14) =210524160a(15) =560849520a(16) =964157040a(17) =17354826720a(18) =32092508448a(19) =641850168960