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A324365
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Number of permutations p of [n] having no index i with |p(i)-i| = 3.
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3
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1, 1, 2, 6, 14, 53, 265, 1554, 11024, 90816, 846032, 8803826, 101011765, 1265197857, 17167351014, 250725968406, 3920074915626, 65310957981693, 1154885557082749, 21599009876309400, 425919898969718528, 8831294211199266816, 192065262001816123136
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OFFSET
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0,3
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LINKS
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FORMULA
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EXAMPLE
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a(4) = 14: 1234, 1243, 1324, 1342, 1423, 1432, 2134, 2143, 2314, 2413, 3124, 3142, 3214, 3412.
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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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