Number of squarefree words of length n in a 5-ary alphabet, with new values 0..4 introduced in increasing order.

A215071

Number of squarefree words of length n in a 5-ary alphabet, with new values 0..4 introduced in increasing order.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =39a(6) =138a(7) =503a(8) =1864a(9) =6936a(10) =25868a(11) =96512a(12) =360203a(13) =1344408a(14) =5018051a(15) =18729944a(16) =69910398a(17) =260943079a(18) =973980990a(19) =3635421345a(20) =13569354266a(21) =50648137765a(22) =189046143161

External references