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A035890 Coordination sequence for diamond structure D^+_28. (Edges defined by l_1 norm = 1.) 0

%I

%S 1,0,1568,0,410816,0,43381856,0,2485013888,0,90102925472,0,

%T 2275791199808,0,42760561395424,3758096384,627153507629824,

%U 544923975680,7450881715909408,27028229193728,73852826419374016

%N Coordination sequence for diamond structure D^+_28. (Edges defined by l_1 norm = 1.)

%D J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.

%H 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://neilsloane.com/doc/Me220.pdf">pdf</a>).

%p 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=28.

%K nonn

%O 0,3

%A Joan Serra-Sagrista (jserra(AT)ccd.uab.es)

%E Recomputed by _N. J. A. Sloane_, Nov 27 1998

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Last modified May 24 21:58 EDT 2022. Contains 354043 sequences. (Running on oeis4.)