134217742domain: NAppears in sequencesa(n) = 2^n + ceiling(n/2).at n=27A134522a(n) = 2^(2*n - 1) + n.at n=13A221130Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nonincreasing x(i,j)-x(i-1,j) in the j direction.at n=25A250737