Number of (2+1) X (n+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.

A250784

Number of (2+1) X (n+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) =18a(1) =46a(2) =106a(3) =238a(4) =518a(5) =1106a(6) =2326a(7) =4838a(8) =9978a(9) =20446a(10) =41686a(11) =84658a(12) =171398a(13) =346166a(14) =697786a(15) =1404398a(16) =2823078a(17) =5669266a(18) =11375926a(19) =22812358a(20) =45722618a(21) =91603646a(22) =183463606a(23) =367341938a(24) =735354918a(25) =1471795606a(26) =2945348026a(27) =5893538638

External references