75234domain: NAppears in sequencesNumber of cycles in the complement of a path.at n=10A006184Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UH, HU and HH.at n=20A329699G.f. satisfies A(x) = 1/(1-x)^2 + x^2*A(x)^4.at n=9A364622