Number of nX2 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.

A283341

Number of nX2 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.

Terms

    a(0) =0a(1) =0a(2) =6a(3) =26a(4) =120a(5) =524a(6) =2174a(7) =8816a(8) =35036a(9) =137164a(10) =530660a(11) =2033212a(12) =7728080a(13) =29176258a(14) =109517952a(15) =409053414a(16) =1521210528a(17) =5635589250a(18) =20807397706a(19) =76591784712a(20) =281168155840

External references