A234489 Number of (n+1) X (7+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).

220334, 765738, 2659824, 9288710, 32545706, 114484712, 404043442, 1431125914, 5084793448, 18127421166, 64813774926, 232475602952, 836155485018, 3016451992646, 10910475434292, 39574863492918, 143905533079266

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..34

Example

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

Crossrefs

Column 7 of A234490.

Sequence in context: A257207 A204968 A294014 * A321160 A223369 A254509

Adjacent sequences: A234486 A234487 A234488 * A234490 A234491 A234492

Keyword

nonn

Author

R. H. Hardin, Dec 26 2013

Status

approved