539181

Appears in sequences

• Number of morphically primitive words w in {1,2,3,...}^* of length n (modulo renaming), also the number of words (length n) which are fixed points of nontrivial morphisms, also the number of succinct patterns of length n in canonical form, also the number of words which have an unambiguous morphic image in {a,b}^*.at n=11A131747
• Number of pyramid polycubes of a given volume in dimension 3.at n=28A229914