A235243 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 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

3746, 10866, 31858, 108374, 359962, 1305758, 4596034, 17276982, 63001946, 243085134, 909934434, 3586769950, 13711602746, 55035076230, 214054835346, 872409743726, 3441514152170, 14207234974590, 56691746507634

Offset

1,1

Comments

Column 3 of A235248.

Links

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

R. H. Hardin, Empirical recurrence of order 61

Formula

Empirical recurrence of order 61 (see link above).

Example

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

Crossrefs

Sequence in context: A166262 A340403 A235977 * A368589 A180974 A285158

Adjacent sequences: A235240 A235241 A235242 * A235244 A235245 A235246

Keyword

nonn

Author

R. H. Hardin, Jan 05 2014

Status

approved