Number of commuting pairs of equivalence relations on [n].
A354458
Number of commuting pairs of equivalence relations on [n].
Terms
- a(0) =1a(1) =1a(2) =4a(3) =19a(4) =117a(5) =864a(6) =7459a(7) =73749a(8) =818960a(9) =10078023
External references
- oeis: A354458