A234906 Number of (n+1) X (2+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

1720, 12336, 88092, 692608, 5287952, 42777680, 333040552, 2723879976, 21343299552, 175549177208, 1379240212124, 11389288475912, 89624213348668, 742558641862440, 5850433339736772, 48618109622714396, 383454721019056852

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 87

Formula

Empirical recurrence of order 87 (see link above).

Example

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

Crossrefs

Column 2 of A234911.

Sequence in context: A237932 A276458 A252857 * A205195 A200958 A048958

Adjacent sequences: A234903 A234904 A234905 * A234907 A234908 A234909

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved