1,4

a(n) is odd.

Table of n, a(n) for n=1..75.

a(n) is expected to be asymptotic to 2n/3.

Sequence in context: A130821 A129756 A339971 * A196186 A075753 A006166

Adjacent sequences: A156721 A156722 A156723 * A156725 A156726 A156727

nonn

Benoit Cloitre, Feb 14 2009

approved