Number of functions from a set to itself such that the sizes of the preimages of the individual elements in the range form the n-th partition in Abramowitz and Stegun order.
A049009
Number of functions from a set to itself such that the sizes of the preimages of the individual elements in the range form the n-th partition in Abramowitz and Stegun order.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =18a(6) =6a(7) =4a(8) =48a(9) =36a(10) =144a(11) =24a(12) =5a(13) =100a(14) =200a(15) =600a(16) =900a(17) =1200a(18) =120a(19) =6a(20) =180a(21) =450a(22) =300a(23) =1800a(24) =7200a(25) =1800a(26) =7200a(27) =16200a(28) =10800a(29) =720
External references
- oeis: A049009