877968

Appears in sequences

• Number of permutations p() of 1..n+4 with centered difference p(i+1)-p(i-1) < 0 exactly 3 times.at n=5A180881
• Number of permutations p() of 1..n+6 with centered difference p(i+1)-p(i-1) < 0 exactly 5 times.at n=3A180883
• Array read by antidiagonals: T(n,k)=number of permutations p() of 1..n+k with centered difference p(i+1)-p(i-1) < 0 exactly k-1 times.at n=39A180887
• Array read by antidiagonals: T(n,k)=number of permutations p() of 1..n+k with centered difference p(i+1)-p(i-1) < 0 exactly k-1 times.at n=41A180887