Number of n-block bicoverings of an n-set.
A275517
Number of n-block bicoverings of an n-set.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =4a(4) =39a(5) =472a(6) =7255a(7) =131876a(8) =2771685a(9) =66253552a(10) =1775801814a(11) =52761229240
External references
- oeis: A275517