216804

Appears in sequences

• Number of permutations p of {1,...,n} such that exactly two elements of {p(1),...,p(i-1)} are between p(i) and p(i+1) for all i from 3 to n-1.at n=25A187817
• a(n) is the number of representative four-color bracelets (necklaces with turning over allowed) with n beads, for n >= 4.at n=9A214309