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A035843
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Coordination sequence for A_17 lattice.
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0
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1, 306, 23562, 822018, 16639974, 224676522, 2214405618, 16967926746, 105864434424, 556959705302, 2538818182782, 10244035242630, 37221177046410, 123490242018990, 378407481456870, 1081149205136382
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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 (17, -136, 680, -2380, 6188, -12376, 19448, -24310, 24310, -19448, 12376, -6188, 2380, -680, 136, -17, 1).
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FORMULA
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Sum_{d=1..17} C(18, d)*C(m/2-1, d-1)*C(17-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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