2122212

Appears in sequences

• k th digit of a(n) = number of different digits within 2 places of k (not including k).at n=28A039987
• k th digit of a(n) is the number of different digits within 3 of k (not including k).at n=28A039989
• A sequence of words over an alphabet of two letters: a(0) = 1, a(1) = 2; a(n+2) = a(n+1)a(n)a(n+1).at n=3A125058
• List of Nyldon words over {1,2}.at n=38A328073