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A035889 Coordination sequence for diamond structure D^+_26. (Edges defined by l_1 norm = 1.) 0
1, 0, 1352, 0, 305552, 0, 27866072, 0, 1381251872, 0, 43450388072, 0, 955155127472, 33554432, 15676941638904, 11777605632, 201710366471744, 796951314432, 2112804738688904, 24705490747392, 18563618015178704 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

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

LINKS

Table of n, a(n) for n=0..20.

J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).

MAPLE

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=26.

CROSSREFS

Sequence in context: A154375 A243132 A349070 * A192320 A237310 A035763

Adjacent sequences:  A035886 A035887 A035888 * A035890 A035891 A035892

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

Recomputed by N. J. A. Sloane, Nov 27 1998

STATUS

approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)