22981

Appears in sequences

• Composite numbers whose prime factors contain no digits other than 6 and 7.at n=8A036322
• Number of length n+2 0..6 arrays with no three elements in a row with pattern aba or abb (with a!=b) and new values 0..6 introduced in 0..6 order.at n=8A243515
• Partial sums of A299896.at n=36A299897
• Numbers of squares formed by this procedure on n-th step: Step 1, draw a unit square. Step n, draw a unit square with center in every intersection of lines of the figure in step n-1.at n=20A336288
• Number of ordered trees with n+1 leaves, no node of outdegree 1, and having as many leaves marked as the number of nodes of outdegree greater than 1.at n=6A368178