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Search: id:A019560
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| A019560 |
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Coordination sequence for C_4 lattice. |
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+0
3
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| 1, 32, 192, 608, 1408, 2720, 4672, 7392, 11008, 15648, 21440, 28512, 36992, 47008, 58688, 72160, 87552, 104992, 124608, 146528, 170880, 197792, 227392, 259808, 295168, 333600, 375232, 420192, 468608
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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R. Bacher, P. de la Harpe and B. Venkov, Series de croissance et series d'Ehrhart associees aux reseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.
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FORMULA
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(32/3)*n*(1+2*n^2), n >= 1; G.f.: (1+28*x+70*x^2+28*x^3+x^4)/(1-x)^4.
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CROSSREFS
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Adjacent sequences: A019557 A019558 A019559 this_sequence A019561 A019562 A019563
Sequence in context: A035286 A029534 A120046 this_sequence A130811 A119286 A125342
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KEYWORD
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nonn
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AUTHOR
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mbaake(AT)sunelc3.tphys.physik.uni-tuebingen.de (Michael Baake)
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