Number of sets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the set.
A320205
Number of sets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the set.
Terms
- a(0) =73a(1) =976a(2) =8416a(3) =59488a(4) =375698a(5) =2209276a(6) =12376430a(7) =66974912a(8) =353260192a(9) =1827146732a(10) =9306483104a(11) =46822023764a(12) =233203697318
External references
- oeis: A320205