Number of 2 X n 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
A281654
Number of 2 X n 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =4a(2) =70a(3) =400a(4) =2128a(5) =10512a(6) =49352a(7) =225024a(8) =1003104a(9) =4395200a(10) =19006304a(11) =81319168a(12) =344886784a(13) =1452055808a(14) =6075680384a(15) =25286555648a(16) =104754555392a(17) =432208419840
External references
- oeis: A281654