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A035910
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Coordination sequence for diamond structure D^+_68. (Edges defined by l_1 norm = 1.)
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0
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1, 9248, 14260416, 8807231072, 2920221095296, 604286975278752, 85587416923429440, 8833008614958340320, 695102146176221154048, 43172047917347942629664, 2174464783015655477758912, 90787245914896872516139872
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| 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
| 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
| 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=68.
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CROSSREFS
| Sequence in context: A092005 A031848 A184211 * A202466 A013815 A013900
Adjacent sequences: A035907 A035908 A035909 * A035911 A035912 A035913
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KEYWORD
| nonn
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AUTHOR
| 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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