115607310domain: NAppears in sequencesNumber of dissections of a polygon: binomial(6n,n)/(5n+1).at n=9A002295Number of nonequivalent noncrossing triangular cacti with n triangles up to rotation.at n=11A361237Number of achiral polyominoes with n heptagonal cells of the hyperbolic regular tiling with Schläfli symbol {7,oo}.at n=18A389563