Number of (n+1)X(2+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.

A253692

Number of (n+1)X(2+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.

Terms

    a(0) =40a(1) =76a(2) =146a(3) =304a(4) =602a(5) =1182a(6) =2416a(7) =4772a(8) =9652a(9) =19152a(10) =38524a(11) =76996a(12) =154072a(13) =308634a(14) =617062a(15) =1236382a(16) =2472602a(17) =4951496a(18) =9907740a(19) =19832536a(20) =39695188a(21) =79445558a(22) =159023072a(23) =318264564a(24) =637042828a(25) =1275004742a(26) =2551980574a(27) =5107782140

External references