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A035758
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Coordination sequence for C_21 lattice.
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1
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1, 882, 130242, 7796978, 255582978, 5369283570, 79749022402, 895903147122, 7996359740418, 58861356563058, 367891005738690, 1998142759241202, 9609441659124482, 41553956372047602, 163646115158499522, 593216067051658610, 1997319977281662978, 6294200366345505138, 18687294283503843522
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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))^21.
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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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