A198722 Number of n X 7 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor.

203, 7817980, 846047363854, 96356630422085931, 10996875674843226590993, 1255145613308486512244031328, 143258513960209594417739070314380, 16351094722174331189725220168411285754, 1866264648662016827992654208819869556160352

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..200

Example

Some solutions with all values 0 to 6 for n=3:
  0 1 0 2 3 4 5     0 1 0 2 1 3 0     0 1 0 2 0 1 3
  1 0 1 0 2 6 4     1 0 1 0 4 0 2     1 0 1 0 4 5 1
  0 1 0 3 6 0 2     0 1 0 3 5 3 6     0 1 0 3 6 1 2

Crossrefs

Column 7 of A198723.

Sequence in context: A208465 A208471 A348823 * A198913 A224983 A138605

Adjacent sequences: A198719 A198720 A198721 * A198723 A198724 A198725

Keyword

nonn

Author

R. H. Hardin, Oct 29 2011

Extensions

Terms a(7) and beyond from Andrew Howroyd, Mar 12 2023

Status

approved