Number of rooted chains in set partitions of {1, 2, ..., n}.
A331957
Number of rooted chains in set partitions of {1, 2, ..., n}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =64a(5) =872a(6) =18024a(7) =525520a(8) =20541392a(9) =1036555120a(10) =65591856032
External references
- oeis: A331957