A235010 Number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

40, 224, 936, 3560, 12168, 40968, 128776, 410760, 1234216, 3822728, 11173128, 33988808, 97552008, 293248008, 831164584

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Diagonal of A235017.

Sequence in context: A111176 A072108 A218404 * A235290 A074360 A235885

Adjacent sequences: A235007 A235008 A235009 * A235011 A235012 A235013

Keyword

nonn

Author

R. H. Hardin, Jan 02 2014

Status

approved