The number of factorizations of an n-element set. (Defined below in Comments.)
A338681
The number of factorizations of an n-element set. (Defined below in Comments.)
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =61a(6) =1a(7) =1681a(8) =5041a(9) =15121a(10) =1a(11) =13638241a(12) =1a(13) =8648641a(14) =1816214401a(15) =181880899201a(16) =1a(18) =1a(22) =1
External references
- oeis: A338681