0,3

The number of orbits (equivalence classes) to which the square of Vaille's automorphism partitions the set of A000108(n) Dyck paths of semilength n.

Table of n, a(n) for n=0..13.

a(2n) = 2*A126291(2n) for n>0.

Sequence in context: A274166 A189740 A118841 * A224912 A162724 A244750

Adjacent sequences: A126291 A126292 A126293 * A126295 A126296 A126297

nonn

Antti Karttunen, Jan 02 2007

approved