21319624domain: NAppears in sequencesNumber of (n+1) X (5+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).at n=15A235275G.f. A(x) satisfies A(x) = 1 / (1 - x - x * A(x^2)).at n=19A349365