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

Sequence in context: A163711 A068239 A098683 this_sequence A095761 A121917 A049670

Adjacent sequences: A135476 A135477 A135478 this_sequence A135480 A135481 A135482

nonn,easy,more

N. J. A. Sloane (njas(AT)research.att.com), Feb 22 2008