15875338990domain: NAppears in sequencesNumber of dissections of a polygon: binomial(4*n, n)/(3*n + 1).at n=13A002293Expansion of g.f. A(x) satisfying A(x) = 1 + x*(3*A(x)^2 + A(-x)^2)/4.at n=26A369082Number of achiral polyominoes composed of n pentagonal cells of the hyperbolic regular tiling with Schläfli symbol {5,oo}.at n=25A369472