325446

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=4A000506
• 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=40A008970
• a(n) = 318*2^n - 186 (n>=1).at n=9A304511
• Number of permutations of [2n] having exactly n alternating up/down runs where the first run is not a down run.at n=5A360426