Number of nX2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.
A208577
Number of nX2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.
Terms
- a(0) =2a(1) =12a(2) =159a(3) =3233a(4) =90863a(5) =3319375a(6) =151329962a(7) =8361244271a(8) =547602710174
External references
- oeis: A208577