Number of 3Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280904
Number of 3Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =9a(2) =646a(3) =22568a(4) =492490a(5) =9426050a(6) =162640161a(7) =2636238543a(8) =40818734359a(9) =610807332682
External references
- oeis: A280904