A235171 Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

8688, 45776, 240020, 1264228, 6664620, 35209872, 186233144, 986928332, 5236116224, 27831579620, 148096235716, 789461093804, 4212865815920, 22520692982832, 120511765742428, 645968908638908, 3465944872151148

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Column 3 of A235175.

Sequence in context: A214487 A254697 A242140 * A237875 A237876 A237874

Adjacent sequences: A235168 A235169 A235170 * A235172 A235173 A235174

Keyword

nonn

Author

R. H. Hardin, Jan 04 2014

Status

approved