Square array whose entry A(n,k) is the number of endofunctions on a set of size n with preimage constraint {0,1,...,k}, for n >= 0, k >= 0, read by descending antidiagonals.
A306800
Square array whose entry A(n,k) is the number of endofunctions on a set of size n with preimage constraint {0,1,...,k}, for n >= 0, k >= 0, read by descending antidiagonals.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =1a(8) =2a(9) =0a(10) =1a(11) =1a(12) =4a(13) =6a(14) =0a(15) =1a(16) =1a(17) =4a(18) =24a(19) =24a(20) =0a(21) =1a(22) =1a(23) =4a(24) =27a(25) =204a(26) =120a(27) =0a(28) =1a(29) =1
External references
- oeis: A306800