Number of squarefree words of length n in an 8-ary alphabet, with new values 0..7 introduced in increasing order.
A215074
Number of squarefree words of length n in an 8-ary alphabet, with new values 0..7 introduced in increasing order.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =40a(6) =154a(7) =660a(8) =3113a(9) =15893a(10) =86857a(11) =502092a(12) =3036032a(13) =19006591a(14) =122119857a(15) =799665333a(16) =5308126648a(17) =35576413852a(18) =240063646519
External references
- oeis: A215074