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Search: id:A035922
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| A035922 |
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Coordination sequence for diamond structure D^+_92. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 16928, 47770816, 53961910368, 32693191777664, 12344924033021088, 3184972567869380160, 597507392393892768480, 85262234662439382964992, 9575709164465078419148576, 869413362323354953321410496
(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=92.
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CROSSREFS
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Sequence in context: A096550 A061364 A088164 this_sequence A121669 A043621 A076774
Adjacent sequences: A035919 A035920 A035921 this_sequence A035923 A035924 A035925
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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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