Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX2 array with new integer colors introduced in row major order.
A216691
Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX2 array with new integer colors introduced in row major order.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =90a(4) =1451a(5) =33694a(6) =1047754a(7) =41569451a(8) =2033056870a(9) =119455094071
External references
- oeis: A216691