A230700 Number of (n+3)X(n+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
2, 28, 2106, 121382, 43853402, 13663471254, 26681634560690, 45145901233869558, 479398570293769095556, 4408105907275837627631446
Offset: 1
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Examples
Some solutions for n=2 ..0..x..2..x..2....0..x..0..x..1....0..x..2..x..2....0..x..0..x..1 ..x..1..x..0..x....x..1..x..2..x....x..1..x..0..x....x..1..x..2..x ..0..x..2..x..1....2..x..1..x..0....0..x..1..x..2....0..x..2..x..1 ..x..1..x..2..x....x..0..x..1..x....x..2..x..0..x....x..2..x..0..x ..0..x..0..x..1....2..x..2..x..0....1..x..1..x..2....1..x..1..x..2
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