Number of words covering the alphabet [n] that are irreducible with respect to C, where C is a subset of the alphabet such that all letters in C appear in weakly increasing order within the word.
A386599
Number of words covering the alphabet [n] that are irreducible with respect to C, where C is a subset of the alphabet such that all letters in C appear in weakly increasing order within the word.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =34a(5) =240a(6) =2613a(7) =46488a(8) =1335175a(9) =57040060
External references
- oeis: A386599