A234892 Number of (n+1) X (2+1) 0..6 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).

760, 4024, 20404, 115924, 625480, 3640580, 19965444, 117487100, 648180128, 3842929120, 21274493964, 126918950864, 704449207500, 4225296177556, 23502462471760, 141626870060880, 789204770612276, 4774795329104980

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 51

Formula

Empirical recurrence of order 51 (see link above).

Example

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

Crossrefs

Column 2 of A234898.

Sequence in context: A014747 A258135 A247400 * A233879 A165629 A151633

Adjacent sequences: A234889 A234890 A234891 * A234893 A234894 A234895

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved