45048640

Appears in sequences

• Number of walks on square lattice. Column y=4 of A052174.at n=12A005562
• Triangle read by rows: T(n, k) = binomial(2*n+1, n-k)^2*(2*k+1)/(2*n+1).at n=38A067802
• a(n) is the number of walks from (0,0) to (0,4) that remain in the upper half-plane y >= 0 using 2*n +2 unit steps either up (U), down (D), left (L) or right (R).at n=6A145603