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A136407 Valid strings, in lexicographic order, of Balls ("1") and Strikes ("2") in a Baseball at bat. Numbers that contain only 1's and 2's never exceeding 3 total 2's or 4 total 1's, whichever comes first. +0
2
1, 2, 11, 12, 21, 22, 111, 112, 121, 122, 211, 212, 221, 222, 1111, 1112, 1121, 1122, 1211, 1212, 1221, 1222, 2111, 2112, 2121, 2122, 2211, 2212, 11121, 11122, 11211, 11212, 11221, 11222, 12111, 12112, 12121, 12122, 12211, 12212, 21111, 21112 (list; graph; listen)
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Last modified November 27 14:17 EST 2009. Contains 167569 sequences.


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