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A188978
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Number of nX4 array permutations with each element moved but moved no more than a city block distance of two
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1
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4, 900, 295264, 54113236, 10523263424, 2184414516364, 446454227170968, 90637093836201284, 18447462299508458652, 3757678170703167716673, 765103415743509162801632, 155767055441358236289145024
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 3X4
..2..4..0.11....2..3.10.11....1..6..3.11....2..4..7.11....2..3..0.11
..5..8..9..3....8..1..5..6....9..7..4..2....9.10..3..5....1..8..7..6
.10..1..7..6....0..4..7..9....0..8..5.10....0..1..8..6....9..4..5.10
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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