A235240 Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

210, 3146, 31858, 338282, 2965442, 28726138, 243061138, 2245014658

Offset

1,1

Comments

Diagonal of A235248.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3:
  1 6 3 2     1 6 4 7     7 2 7 2     5 3 5 2     4 1 5 2
  5 4 7 0     2 1 5 2     5 6 5 6     0 4 0 3     1 4 2 5
  2 7 4 3     0 5 3 6     0 7 0 7     3 1 3 0     5 2 6 3
  5 4 7 0     3 2 6 3     5 6 5 6     2 6 2 5     2 5 3 6

Crossrefs

Cf. A235248.

Sequence in context: A024407 A027822 A024449 * A103604 A257711 A061133

Adjacent sequences: A235237 A235238 A235239 * A235241 A235242 A235243

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved