  Let $\textsf{A},\textsf{A}^*$ be the fundamental generators of the
$q-$Onsager algebra. A linear basis for the $q-$Onsager algebra is known as the
`zig-zag' basis [IT09]. In this letter, an attractive basis for the $q-$Onsager
algebra is conjectured, based on the relation between the $q-$Onsager algebra
and a quotient of the infinite dimensional algebra ${\cal A}_q$ introduced in
[BK05].
