A234920 Number of (n+1) X (7+1) 0..4 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).

39720, 169128, 710304, 4151672, 22970144, 150606424, 911837036, 6251426440, 39266933948, 276635826688, 1778814863004, 12796967663216, 83932949350360, 614139960280996, 4103610483499364, 30438970840376560, 207060580976230816

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..100

Example

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

Crossrefs

Column 7 of A234921.

Sequence in context: A236132 A204311 A235255 * A116220 A103809 A257192

Adjacent sequences: A234917 A234918 A234919 * A234921 A234922 A234923

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved