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A035768
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Coordination sequence for C_31 lattice.
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1
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1, 1922, 616962, 79711106, 5573863426, 245955974018, 7532156369410, 170856126160770, 3010714725097474, 42741155411865474, 503090409749666306, 5025399107633316738, 43425584300428732418, 329863641871506905986, 2232693297068905613826, 13622726261084045211522
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OFFSET
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0,2
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LINKS
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J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
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FORMULA
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a(n) = [x^(2n)] ((1+x)/(1-x))^31.
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
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EXTENSIONS
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STATUS
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approved
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