Number of endofunctions on [n] with distinct cardinalities of the nonempty preimages.
A231807
Number of endofunctions on [n] with distinct cardinalities of the nonempty preimages.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =21a(4) =52a(5) =305a(6) =7836a(7) =24703a(8) =155688a(9) =1034433a(10) =67124260a(11) =235173191a(12) =1728147312a(13) =11309344813a(14) =106962615592
External references
- oeis: A231807