Number of n X 2 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.
A208402
Number of n X 2 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.
Terms
- a(0) =2a(1) =15a(2) =187a(3) =2795a(4) =43947a(5) =700075a(6) =11188907a(7) =178973355a(8) =2863377067a(9) =45813246635a(10) =733008800427
External references
- oeis: A208402