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The sequence is obtained continuously by applying the look-and-say rule from seed 2 : 2 -> 1,2 -> 1,1,1,2 -> etc. The sequence is then determined by pairs of digits. Terms of even ranks are counts while odd ranks are figures. A225224 and A221646 are from seed 1 and A088204 from seed 3.
The present sequence is the concatenation of A006751 (original look-and-say method by blocks) because, with seed 2, all blocks of A006751 begin by with 1 or 3 and end by with 2 and therefore, there is no possible interaction between blocks after concatenation. (end)
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nonn,base,easy,tabf,changed
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From Jean-Christophe Hervé, May 07 2013: (Start)
The present sequence is the concatenation of A006751 (original look-and-say method by blocks) because, with seed 2, all blocks of A006751 begin by 1 or 3 and end by 2 and therefore, there is no possible interaction between blocks after concatenation. (end)
(original look-and-say method by blocks) because, with seed 2, all blocks of A006751 begin by 1 or 3 and end by 2 and therefore, there is no possible interaction between blocks after concatenation.[Jean-Christophe Hervé, May 07 2013]
_Reinhard Zumkeller_, , <a href="/A088203/b088203.txt">Rows n = 1..25 of triangle, flattened</a>
Eric W. Weisstein's World of Mathematics, , <a href="http://mathworld.wolfram.com/LookandSaySequence.html">MathWorld: Look and Say Sequence</a>
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