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Search: id:A035912
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| A035912 |
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Coordination sequence for diamond structure D^+_72. (Edges defined by l_1 norm = 1.) |
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1
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| 1, 10368, 17922816, 12407366016, 4610216314368, 1068744800817792, 169506887987474688, 19580193687475702656, 1723599538143585831936, 119669709626799156403328, 6733021714697626592585472, 313769325989254807329936768
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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=72.
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CROSSREFS
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Sequence in context: A144125 A097695 A031803 this_sequence A104439 A031866 A157445
Adjacent sequences: A035909 A035910 A035911 this_sequence A035913 A035914 A035915
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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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