425976
domain: N
Appears in sequences
- Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k up-down runs (1 <= k <= n).at n=49A186370
- Number of permutations p of [2n] such that 0p has exactly n alternating runs.at n=5A291677
- Number of permutations p of [n] such that 0p has exactly ceiling(n/2) alternating runs.at n=10A303160