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A215846
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Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the even squares of an n X 7 array with new integer colors introduced in row major order.
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1
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1, 5, 52, 8460, 908408, 1590366402, 621070325112, 3815473909467500, 3338879032079931702, 49279739016010612438482, 78078252717220869748888110, 2271020746204851403136701359870, 5766825640795432616276139021743234, 292268929366529401852293167022121562170
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OFFSET
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0,2
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LINKS
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EXAMPLE
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Some solutions for n=3:
..0..x..1..x..2..x..3....0..x..1..x..2..x..3....0..x..1..x..2..x..3
..x..3..x..4..x..5..x....x..2..x..4..x..5..x....x..4..x..0..x..5..x
..1..x..2..x..0..x..1....6..x..7..x..0..x..6....3..x..5..x..6..x..4
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(0)=1 prepended and terms a(7) and beyond from Andrew Howroyd, Jun 26 2017
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STATUS
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approved
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