17845927498domain: NAppears in sequencesNumber of (1,0) steps in all peakless Motzkin paths of length n (can be easily translated into RNA secondary structure terminology).at n=26A110236a(n) = hypergeom([-n, 1 + n, 2 + n, -1 - n], [1/2, 1/2, 1], 1/16). Row sums of A370233.at n=13A370234