Number of labeled antichains of finite sets spanning some subset of {1,...,n} with singleton edges allowed.
A305000
Number of labeled antichains of finite sets spanning some subset of {1,...,n} with singleton edges allowed.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =72a(4) =1824a(5) =220608a(6) =498243968
External references
- oeis: A305000