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Search: id:A035881
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| A035881 |
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Coordination sequence for diamond structure D^+_10. (Edges defined by l_1 norm = 1.) |
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+0
1
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| 1, 0, 200, 0, 6800, 512, 103000, 28160, 935200, 366080, 5805032, 2562560, 27135920, 12446720, 102442360, 47297536, 328075840, 150492160, 922953480, 418401280, 2339194064, 1046003200, 5442091160
(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=10.
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CROSSREFS
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Sequence in context: A111472 A033523 A094220 this_sequence A114984 A118118 A124472
Adjacent sequences: A035878 A035879 A035880 this_sequence A035882 A035883 A035884
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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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