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A209539
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Number of nX4 array permutations with every element making zero or one right-handed knight moves (out 2, right 1)
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1
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1, 4, 72, 729, 6480, 63504, 635040, 6350400, 63504000, 635040000, 6350400000, 63504000000, 635040000000, 6350400000000, 63504000000000, 635040000000000, 6350400000000000, 63504000000000000, 635040000000000000
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