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Search: id:A035903
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| A035903 |
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Coordination sequence for diamond structure D^+_54. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 5832, 5672592, 2211553368, 463476372768, 60724672249320, 5457607130811312, 358366157766535032, 17998379213837249088, 715924864099841086728, 23183082546450209810640, 624911460076695388372632
(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=54.
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CROSSREFS
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Sequence in context: A104284 A131494 A147859 this_sequence A114771 A013809 A013888
Adjacent sequences: A035900 A035901 A035902 this_sequence A035904 A035905 A035906
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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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