206968

Appears in sequences

• a(n) = Sum_{k=0..floor(n/2)} A026637(n, k).at n=18A026645
• Number of (n+1) X (4+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=20A250725
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 313) or the same sequence for the mesh pattern (12, 403).at n=12A289608
• Fourier coefficients of a modular form studied by Koike.at n=27A341304