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Search: id:A035891
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| A035891 |
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Coordination sequence for diamond structure D^+_30. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 0, 1800, 0, 541200, 0, 65520920, 0, 4296107040, 0, 177923724072, 0, 5119703270960, 0, 109262828065080, 536870912, 1814093339150400, 249644974080, 24305082449321800, 21968757719040, 270526359458466384
(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=30.
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CROSSREFS
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Sequence in context: A114075 A013593 A090232 this_sequence A025139 A035767 A107563
Adjacent sequences: A035888 A035889 A035890 this_sequence A035892 A035893 A035894
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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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