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A035779
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Coordination sequence for C_42 lattice.
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1
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1, 3528, 2076816, 490681688, 62456027424, 4985149915368, 273998113272240, 11053262513080440, 342841481215636032, 8471578904288191496, 171504713146698879696, 2910051399340259388312, 42170689218812731525984
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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))^42.
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MAPLE
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seq(coeff(series(((1+x)/(1-x))^42, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018
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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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