55393

Appears in sequences

• First gap of n in sequence A038593 (lower terms).at n=30A038661
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (0, 1), (1, -1)}.at n=11A151260
• a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k,2*n-4*k).at n=18A387647