Smallest number with a n-character traditional Japanese notation.

Terms

a(0) =1a(1) =11a(2) =21a(3) =121a(4) =221a(5) =1121a(6) =1221a(7) =11121a(8) =11221a(9) =111221a(10) =211221a(11) =1211221a(12) =2211221a(13) =11211221a(14) =12211221a(15) =111211221a(16) =112211221a(17) =1112211221a(18) =2112211221a(19) =12112211221a(20) =22112211221a(21) =112112211221a(22) =122112211221