Number of chains in partitions of [n] ordered by refinement.
A330804
Number of chains in partitions of [n] ordered by refinement.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =15a(4) =127a(5) =1743a(6) =36047a(7) =1051039a(8) =41082783a(9) =2073110239a(10) =131183712063
External references
- oeis: A330804