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A035893 Coordination sequence for diamond structure D^+_34. (Edges defined by l_1 norm = 1.) 0

%I

%S 1,0,2312,0,892432,0,138504984,0,11614313504,0,613171117352,0,

%T 22402282117680,0,604244840324920,0,12614155679414336,8589934592,

%U 211305560531644744,5111011082240,2922614819105183312

%N Coordination sequence for diamond structure D^+_34. (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=34.

%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 July 1 07:30 EDT 2022. Contains 354952 sequences. (Running on oeis4.)