805146624

Appears in sequences

• Number of permutations of 1..n in which every pair of adjacent numbers are relatively prime.at n=16A076220
• Number of ways to arrange the numbers 1..n in a circle (up to direction) such that every two adjacent numbers are relatively prime.at n=16A086595
• Number of permutations of (the positive integers <= n and coprime to n), where each element of the permutations is coprime to its adjacent elements.at n=16A109813