OFFSET
0,2
COMMENTS
Number of Sturmian palindromes of length n.
LINKS
Michelangelo Bucci, Alessandro De Luca, Amy Glen and Luca Q. Zamboni, A connection between palindromic and factor complexity using return words, arXiv:0802.1332 [math.CO], 2008.
FORMULA
a(n) = A106481(n) + 1. - Filip Zaludek, Dec 16 2016
MAPLE
with(numtheory);
f:=n->1+add(phi(n-2*i), i=0..floor(n/2));
[seq(f(n), n=0..100)];
MATHEMATICA
Table[1 + Sum[EulerPhi[n - 2 i], {i, 0, Floor[n/2]}], {n, 0, 59}] (* Michael De Vlieger, Dec 17 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 08 2013
EXTENSIONS
Name corrected by Michael De Vlieger, Dec 17 2016
STATUS
approved