75116domain: NAppears in sequencesNumber of 4-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions.at n=37A187299a(n) = Sum_{k=1..n} binomial(2*k, k) * phi(k), where phi is the Euler totient function.at n=7A356346