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A035756
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Coordination sequence for C_19 lattice.
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1
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1, 722, 87362, 4298066, 116323586, 2029779538, 25216532290, 238745924050, 1810015572994, 11406058224594, 61497762026306, 290259969857618, 1221518092836098, 4652599114237778, 16237772840882498, 52462123239704786, 158268201857667074, 449093392401112274, 1206082191029270850
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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))^19.
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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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