172645

Appears in sequences

• Triangle read by rows: T(n,k) is the number of paths in the right half-plane from (0,0) to (n,0), consisting of steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0), having k H=(2,0) steps (0 <= k <= floor(n/2)).at n=51A132885
• Expansion of (1 - 2*x + 3*x^2)/(1 - 2*x - 3*x^2)^(5/2).at n=9A373651