656011

Appears in sequences

• Number of (n+2) X (3+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=14A252956
• Number of unlabeled rooted identity trees with n nodes in which the branches of any node with more than one branch have empty intersection.at n=20A316500