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Search: id:A035896
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| A035896 |
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Coordination sequence for diamond structure D^+_40. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 0, 3200, 0, 1708800, 0, 366366080, 0, 42340840960, 0, 3070951360128, 0, 153524473002240, 0, 5639746542798720, 0, 159505036253752320, 0, 3599066875202445440, 0, 66639047830192168704, 21990232555520
(list; graph; listen)
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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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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=40.
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CROSSREFS
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Sequence in context: A115932 A137839 A069401 this_sequence A035777 A108001 A023308
Adjacent sequences: A035893 A035894 A035895 this_sequence A035897 A035898 A035899
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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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