1,1

Two words are considered identical in the cyclic sense if one is a cyclic shift of the other.

An abelian cube is a word of the form x x' x'' where x' and x'' are permutations of x.

Table of n, a(n) for n=1..11.

For n = 4 the a(4) = 15 such words are {0011, 0012, 0021, 0022, 0101, 0102, 0112, 0121, 0122, 0202, 0211, 0212, 0221, 1122, 1212}.

Sequence in context: A143869 A165298 A117148 * A320687 A340494 A039567

Adjacent sequences: A305592 A305593 A305594 * A305596 A305597 A305598

nonn,more

Jeffrey Shallit, Jun 05 2018

approved