438496

Appears in sequences

• Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=40A262372
• Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=41A262372
• Number of ordered pairs (p,q) of permutations of [2n] with equal up-down signatures and p(1)=q(1)=n.at n=4A262379
• Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=4.at n=4A321060
• Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=5.at n=3A321061