Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

A250778

Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

Terms

    a(0) =46a(1) =106a(2) =230a(3) =482a(4) =990a(5) =2010a(6) =4054a(7) =8146a(8) =16334a(9) =32714a(10) =65478a(11) =131010a(12) =262078a(13) =524218a(14) =1048502a(15) =2097074a(16) =4194222a(17) =8388522a(18) =16777126a(19) =33554338a(20) =67108766a(21) =134217626a(22) =268435350a(23) =536870802a(24) =1073741710a(25) =2147483530a(26) =4294967174

External references