1910706

Appears in sequences

• One half of the number of permutations of [n] such that the differences have 5 runs with the same signs.at n=5A000506
• Triangle T(n,k) = P(n,k)/2, n >= 2, 1 <= k < n, of one-half of number of permutations of 1..n such that the differences have k runs with the same signs.at n=49A008970