Number of n X 1 0..3 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.
A268069
Number of n X 1 0..3 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =39a(5) =138a(6) =499a(7) =1830a(8) =6723a(9) =24714a(10) =90751a(11) =332910a(12) =1219947a(13) =4466562a(14) =16340935a(15) =59746326a(16) =218334531a(17) =797537226a(18) =2912254303a(19) =10631252766a(20) =38800597851a(21) =141582417426a(22) =516549545527
External references
- oeis: A268069