Number T(n,k) of endofunctions on [n] such that the minimal cardinality of the nonempty preimages equals k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.
A245687
Number T(n,k) of endofunctions on [n] such that the minimal cardinality of the nonempty preimages equals k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =2a(6) =0a(7) =24a(8) =0a(9) =3a(10) =0a(11) =216a(12) =36a(13) =0a(14) =4a(15) =0a(16) =2920a(17) =200a(18) =0a(19) =0a(20) =5a(21) =0a(22) =44100a(23) =2250a(24) =300a(25) =0a(26) =0a(27) =6a(28) =0a(29) =799134
External references
- oeis: A245687