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A035906
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Coordination sequence for diamond structure D^+_60. (Edges defined by l_1 norm = 1.)
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0
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1, 7200, 8644800, 4158723680, 1074729932160, 173483353200288, 19187724061887040, 1548407735451345120, 95421058074344344320, 4648998863987510065440, 184032053624967973166016, 6051292765125604899742560
(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=60.
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CROSSREFS
| Sequence in context: A064979 A204480 A190114 * A181259 A202402 A206469
Adjacent sequences: A035903 A035904 A035905 * A035907 A035908 A035909
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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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