In an alternating permutation of numbers 1 to n, the numbers are arranged so that they alternately increase and decrease. For example, there are five alternating permutations of the numbers 1, 2, 3, and 4:
1 3 2 4
1 4 2 3
2 3 1 4
2 4 1 3
3 4 1 2
Write a function to count the alternating permutations for a set of n numbers.
Suggestion: You might also try Cody Problem 46034.
Solve

Solution Stats

18 Solutions

11 Solvers

Last Solution submitted on May 30, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers11

Chris Cleveland Dyuman Joshi Christian Schröder xin

Suggested Problems

More from this Author327

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!