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A035850
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Coordination sequence for A_24 lattice.
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0
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1, 600, 90300, 6100200, 235597650, 5953712520, 107392877100, 1469778991800, 15969368635950, 142638039461400, 1076681464768860, 7023070170402600, 40317756506959050, 206818794600952200, 960154451013729900
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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).
Index entries for linear recurrences with constant coefficients, signature (24, -276, 2024, -10626, 42504, -134596, 346104, -735471, 1307504, -1961256, 2496144, -2704156, 2496144, -1961256, 1307504, -735471, 346104, -134596, 42504, -10626, 2024, -276, 24, -1).
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FORMULA
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Sum_{d=1..24} C(25, d)*C(m/2-1, d-1)*C(24-d+m/2, m/2), where norm m is always even.
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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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STATUS
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approved
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