A234994 Number of (n+1) X (3+1) 0..6 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).

5280, 32256, 222672, 1843956, 16100096, 147975544, 1383273540, 13136508448, 125711250208, 1212052600920, 11747496084952, 114450976252720, 1119844141118852, 11002825088380684, 108500718690978524

Offset

1,1

Links

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

Example

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

Crossrefs

Column 3 of A234998.

Sequence in context: A274361 A223494 A265985 * A223341 A270798 A237002

Adjacent sequences: A234991 A234992 A234993 * A234995 A234996 A234997

Keyword

nonn

Author

R. H. Hardin, Jan 02 2014

Status

approved