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Search: id:A035913
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| A035913 |
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Coordination sequence for diamond structure D^+_74. (Edges defined by l_1 norm = 1.) |
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+0
1
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| 1, 10952, 19998352, 14622792792, 5738394543392, 1404752160252392, 235229004437967792, 28681579910712931192, 2664365874852346628672, 195158177512774353963272, 11580217136184545769201872, 568940488664988221460830872
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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=74.
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CROSSREFS
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Sequence in context: A045156 A003919 A105716 this_sequence A124668 A104323 A034712
Adjacent sequences: A035910 A035911 A035912 this_sequence A035914 A035915 A035916
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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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