884731domain: NAppears in sequencesNumber of (n+1)X(5+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=14A250653a(n) = 27*2^n - 5.at n=15A304387