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Search: id:A019558
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| A019558 |
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Coordination sequence for F_4 lattice. |
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+0
3
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| 1, 48, 384, 1392, 3456, 6960, 12288, 19824, 29952, 43056, 59520, 79728, 104064, 132912, 166656, 205680, 250368, 301104, 358272, 422256, 493440, 572208, 658944, 754032, 857856, 970800, 1093248, 1225584
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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.
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FORMULA
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a(n) = 16*n*(2-3*n+4*n^2), n >= 1; G.f.: (1 + 44*x + 198*x^2 + 140*x^3 + x^4)/(1-x)^4.
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CROSSREFS
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Adjacent sequences: A019555 A019556 A019557 this_sequence A019559 A019560 A019561
Sequence in context: A134607 A037056 A110275 this_sequence A034778 A060674 A042949
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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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