A234669 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 4 (constant-stress 1 X 1 tilings).

29568, 217968, 1604020, 11826092, 87273500, 644848264, 4769561472, 35319420856, 261811840168, 1942988877232, 14433959951680, 107349012026192, 799169229326556, 5956201429623128, 44434739229424040, 331862990142839740

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..154

Example

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

Crossrefs

Column 3 of A234672.

Sequence in context: A232201 A251563 A022200 * A031656 A236734 A236317

Adjacent sequences: A234666 A234667 A234668 * A234670 A234671 A234672

Keyword

nonn

Author

R. H. Hardin, Dec 29 2013

Status

approved