533544

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=38A262372
• 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=43A262372
• Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=2.at n=6A262479
• Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=7.at n=1A321063