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A035893
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Coordination sequence for diamond structure D^+_34. (Edges defined by l_1 norm = 1.)
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0
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1, 0, 2312, 0, 892432, 0, 138504984, 0, 11614313504, 0, 613171117352, 0, 22402282117680, 0, 604244840324920, 0, 12614155679414336, 8589934592, 211305560531644744, 5111011082240, 2922614819105183312
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OFFSET
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0,3
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REFERENCES
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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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LINKS
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Table of n, a(n) for n=0..20.
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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MAPLE
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f := proc(m) local k, t1; t1 := 2^(n-1)*binomial((n+2*m)/2-1, n-1); if m mod 2 = 0 then t1 := t1+add(2^k*binomial(n, k)*binomial(m-1, k-1), k=0..n); fi; t1; end; where n=34.
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CROSSREFS
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Sequence in context: A261210 A020435 A288798 * A260049 A184025 A251436
Adjacent sequences: A035890 A035891 A035892 * A035894 A035895 A035896
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KEYWORD
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nonn
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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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Recomputed by N. J. A. Sloane, Nov 27 1998
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STATUS
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approved
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