128110

Appears in sequences

• Number of permutations of [n] having no isolated entries. An entry j of a permutation p is isolated if it is not preceded by j-1 and not followed by j+1. For example, the permutation 23178564 has 2 isolated entries: 1 and 4.at n=16A180564
• a(n) = floor(M(g(n-1)+1,..,g(n))), where M = harmonic mean and g(n) = n^5.at n=10A227014
• a(n) = (2*n + 1)*(12 + 11*n + 93*n^2 + 4*n^3)/3.at n=11A387439