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A187194
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Number of 7-turn rook's tours on an n X n board summed over all starting positions.
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0
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0, 0, 2304, 156672, 2169600, 15220800, 72182880, 264520704, 806827392, 2144534400, 5120913600, 11222069760
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listen;
history;
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OFFSET
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1,3
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LINKS
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FORMULA
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Empirical G.f.: -96*x^3*(287*x^5+4491*x^4+11886*x^3+8776*x^2+1416*x+24)/(x-1)^9. [Colin Barker, Jul 01 2012]
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EXAMPLE
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Some solutions for 3X3
..2..1..0....1..2..0....0..2..1....0..0..4....5..4..0....4..3..5....4..1..5
..3..6..7....6..0..7....5..3..4....1..2..3....6..0..7....7..1..6....0..7..6
..4..5..0....5..3..4....6..0..7....7..6..5....2..3..1....0..2..0....3..2..0
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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