1260545

Appears in sequences

• a(0) = 1, a(1) = 1 and for n >= 2, a(n) = floor(4 * a(n-2) * a(n-1) / (a(n-2) + a(n-1))).at n=33A093335
• Number of nonequivalent noncrossing triangular cacti with n triangles up to rotation.at n=9A361237