219198

Appears in sequences

• a(n)=number of Catalan knight paths in right half-plane from (0,0) to (n,n).at n=19A096612
• 1/4 the number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.at n=13A189954