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Search: id:A035909
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| A035909 |
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Coordination sequence for diamond structure D^+_66. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 8712, 12655632, 7363888664, 2300684695584, 448681205484072, 59904484213281840, 5829554227763981880, 432708304259607621696, 25358927904615986491976, 1205707495877530248973392, 47541429981663923354785368
(list; graph; listen)
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OFFSET
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0,2
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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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J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
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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=66.
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CROSSREFS
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Sequence in context: A031591 A031771 A031877 this_sequence A031852 A115614 A165630
Adjacent sequences: A035906 A035907 A035908 this_sequence A035910 A035911 A035912
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KEYWORD
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nonn
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AUTHOR
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J. Serra-Sagrista (jserra(AT)ccd.uab.es) Recomputed by N. J. A. Sloane (njas(AT)research.att.com) Nov 27 1998.
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