222110

Appears in sequences

• A summarize Fibonacci sequence starting with a(0)=0 and a(1)=2: summarize the previous two terms!.at n=3A036104
• Ternary numbers consisting of a run of 2's, then a run of 1's, then a run of 0's.at n=18A371053
• Ternary numbers that are concatenated runs C(1)A(1)B(1)C(2)A(2)B(2)...C(k)A(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=19A371111