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

Author

R. H. Hardin, Oct 29 2011

Keywords

• nonn

Examples

			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
		

Links

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

Crossrefs

Column 7 of A198723.

Extensions

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