Number of primitive (aperiodic) words of length n which contain exactly four different symbols.
A056269
Number of primitive (aperiodic) words of length n which contain exactly four different symbols.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =24a(4) =240a(5) =1560a(6) =8400a(7) =40800a(8) =186480a(9) =818280a(10) =3498000a(11) =14674440a(12) =60780720a(13) =249393480a(14) =1016542560a(15) =4123132800a(16) =16664094960a(17) =67171179600a(18) =270232006800
External references
- oeis: A056269