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%I
%S 1,3,4,5,2,3,4,5,7,8,9,10,11,6,7,12,13,14,16,17,18,19,15,16,17,18,19,
%T 21,22,23,24,25,26,27,20,21,22,23,24,25,26,27,29,30,31,32,33,34,35,36,
%U 37,28,29,30,31,32,33,34,35,36,37,39,40,41,42,43,44,45,46,47,48,49,38
%N A self-describing sequence: the length of each run of consecutive integers is given by the sequence itself. Always start a new run with the smallest unused integer so far.
%e ...
%e Seq......1--3,4,5--2,3,4,5--7,8,9,10,11--6,7--
%e Run size:1....3.......4.........5.........2... (the sequence itself)
%e (the 3rd run starts with "2" which is the smallest unused integer so far. The 5th run starts with "6" for the same reason)
%K base,easy,nonn
%O 1,2
%A _Eric Angelini_, Aug 29 2006
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