40996

Appears in sequences

• Number of (4+2) X (n+2) 0..3 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=31A252723
• a(n) is the total number of down steps between the third and fourth up steps in all 3_1-Dyck paths of length 4*n.at n=6A334649