a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} 1 / (1 - x^k/k).
A338437
a(n) = n! * [x^n] Product_{k=1..n, gcd(n,k) = 1} 1 / (1 - x^k/k).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =32a(5) =300a(6) =864a(7) =17612a(8) =74752a(9) =1152792a(10) =6470400a(11) =220057992a(12) =719622144a(13) =40754156352a(14) =192835098624
External references
- oeis: A338437