56286domain: NAppears in sequencesNumber of bicentered 6-valent trees with n nodes.at n=18A036652Triangle read by rows: Coefficients of the polynomials S1(n, x) * EZ(n, x), where S1 denote the Stirling1 polynomials and EZ the Eulerian zig-zag polynomials A205497.at n=44A373429