Number of labeled antichains of finite sets spanning n vertices with singleton edges allowed.
A304999
Number of labeled antichains of finite sets spanning n vertices with singleton edges allowed.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =53a(4) =1577a(5) =212137a(6) =496946349
External references
- oeis: A304999