a(n) is the number of endofunctions on an n-set where there is an element with a preimage of cardinality greater than n/2.
A351118
a(n) is the number of endofunctions on an n-set where there is an element with a preimage of cardinality greater than n/2.
Terms
- a(0) =1a(1) =2a(2) =21a(3) =52a(4) =905a(5) =2436a(6) =58513a(7) =165096a(8) =5053329a(9) =14690260a(10) =546376721a(11) =1621207512a(12) =70973853145a(13) =213746971816
External references
- oeis: A351118