388537

Appears in sequences

• Number of compositions of {1,..,n} such that no two adjacent parts are of equal size (labeled Carlitz compositions).at n=9A114902
• Numbers k such that sigma(sigma(k)) = 2*phi(k).at n=7A135241
• Number A(n,k) of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its k immediate predecessors; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=64A261959