380731

Appears in sequences

• Crystal ball sequence for A_7 lattice.at n=6A008390
• n-th term of the crystal ball sequence for A_{n+1} lattice for n >= 0.at n=6A108628
• Triangle read by rows in which T(n,k) is the number of length k chains from (0,0) to (n,n) of the poset [n] X [n] ordered by the product order, 0 <= k <= 2n, n>=0.at n=56A316649