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Search: id:A035915
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| A035915 |
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Coordination sequence for diamond structure D^+_78. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 12168, 24684816, 20050650776, 8739210543648, 2375502273471912, 441550716354149168, 59738920517881797816, 6154813102726791038016, 499745917657668459264968, 32852573414724334471351632, 1787037602269852702724731608
(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=78.
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CROSSREFS
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Sequence in context: A115674 A013819 A013908 this_sequence A104791 A135128 A137489
Adjacent sequences: A035912 A035913 A035914 this_sequence A035916 A035917 A035918
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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 njas Nov 27 1998.
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