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A113721
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Concatenation of the numbers of equal successive digits of previous two terms read in inverse order, starting with a(0)=a(1)=1.
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2
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1, 1, 2, 11, 21, 112, 131, 11112, 1511, 21114, 131211, 21111131, 115121111, 41113151, 11113141112, 13111511131, 1131311131114, 13131113131311, 2111113111113131112, 13111515121111131111, 41511111311131115151
(list; graph; refs; listen; history; internal format)
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