A234986 Number of (n+1) X (3+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

1640, 6908, 34608, 206556, 1303920, 8616068, 58209538, 400984904, 2799816642, 19780619488, 141031726484, 1013269795948, 7324436942360, 53208482346514, 388059888524356, 2839169810686872, 20824365934488100, 153044591416091762

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 91

Formula

Empirical recurrence of order 91 (see link above).

Example

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

Crossrefs

Column 3 of A234991.

Sequence in context: A239160 A206234 A158775 * A043464 A002434 A146300

Adjacent sequences: A234983 A234984 A234985 * A234987 A234988 A234989

Keyword

nonn

Author

R. H. Hardin, Jan 02 2014

Status

approved