122000domain: NAppears in sequencesTernary numbers consisting of a run of 1's, then a run of 2's, then a run of 0's.at n=17A371051Ternary numbers that are concatenated runs A(1)C(1)B(1)A(2)C(2)B(2)...A(k)C(k)B(k), where A(i) is a run of 1's, B(i) a run of 0's, and C(i) a run of 2's, for i = 1..k.at n=18A371107