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 two elements.
A283380
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 two elements.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =19a(4) =91a(5) =399a(6) =1734a(7) =7257a(8) =29754a(9) =120018a(10) =477678a(11) =1880898a(12) =7339875a(13) =28425538a(14) =109368210a(15) =418413378a(16) =1592767290a(17) =6036395895a(18) =22786979315a(19) =85714057229a(20) =321381104832
External references
- oeis: A283380