37727416576domain: NAppears in sequencesNumber of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=5.at n=6A321061Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=7.at n=4A321063