1048606

Appears in sequences

• Number of (n+1) X (4+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nonincreasing x(i,j)-x(i-1,j) in the j direction.at n=18A250738
• Number of connected induced (non-null) subgraphs of the friendship graph with 2n+1 nodes.at n=9A286186