212222domain: NAppears in sequencesk th digit of a(n) is the number of different digits within 4 of k (not including k).at n=18A039990Reversed shortest (x+1,2x)-code of n.at n=33A233137"Wondrous representation" [right to left] of positive integer n, n >= 2.at n=8A303433List of Nyldon words over {1,2}.at n=22A328073