315031552

Appears in sequences

• a(n) = 4^n*(3*n)!/((n+1)!*(2*n+1)!).at n=8A006335
• Array by antidiagonals: Number of planar lattice walks of length 3n+2k starting at (0,0) and ending at (k,0), remaining in the first quadrant and using only NE,W,S steps.at n=44A098273