A216465 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 7Xn array with new integer colors introduced in row major order.
15, 203, 36401, 4213597, 8195008751, 3376465219485, 22530453266592757, 20538493137072741201
Offset: 1
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Examples
Some solutions for n=4 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x ..x..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0 ..0..x..3..x....0..x..3..x....0..x..1..x....0..x..3..x....0..x..3..x ..x..4..x..2....x..1..x..2....x..2..x..3....x..4..x..1....x..2..x..4 ..5..x..0..x....4..x..5..x....1..x..4..x....1..x..5..x....1..x..5..x ..x..3..x..2....x..6..x..3....x..0..x..1....x..6..x..4....x..4..x..1 ..2..x..1..x....5..x..4..x....4..x..3..x....3..x..0..x....2..x..3..x
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