Number of nX3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
A283517
Number of nX3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
Terms
- a(0) =0a(1) =1a(2) =20a(3) =270a(4) =2763a(5) =26662a(6) =241796a(7) =2115564a(8) =18020972a(9) =150431216a(10) =1235860816a(11) =10022560088a(12) =80412418752a(13) =639331124272
External references
- oeis: A283517