1,1
The list contains A135017(n) strings of length n.
The subset of strings in A135475 that contain no repeated symbol.
Index entries for doubling substrings
Adjacent sequences: A135476 A135477 A135478 this_sequence A135480 A135481 A135482
Sequence in context: A115983 A068239 A098683 this_sequence A095761 A121917 A049670
nonn,easy,more
njas, Feb 22 2008
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