Search: id:A035909
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%I A035909
%S A035909 1,8712,12655632,7363888664,2300684695584,448681205484072,
%T A035909 59904484213281840,5829554227763981880,432708304259607621696,
%U A035909 25358927904615986491976,1205707495877530248973392,47541429981663923354785368
%N A035909 Coordination sequence for diamond structure D^+_66. (Edges defined by 
               l_1 norm = 1.)
%D A035909 J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information 
               Processing Letters, 76, no. 1-2 (2000), 39-44.
%H A035909 J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination 
               Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (<a href="http:/
               /www.research.att.com/~njas/doc/ldl7.txt">Abstract</a>, <a href="http:/
               /www.research.att.com/~njas/doc/ldl7.pdf">pdf</a>, <a href="http:/
               /www.research.att.com/~njas/doc/ldl7.ps">ps</a>).
%p A035909 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=66.
%Y A035909 Sequence in context: A031591 A031771 A031877 this_sequence A031852 A115614 
               A165630
%Y A035909 Adjacent sequences: A035906 A035907 A035908 this_sequence A035910 A035911 
               A035912
%K A035909 nonn
%O A035909 0,2
%A A035909 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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