

A035888


Coordination sequence for diamond structure D^+_24. (Edges defined by l_1 norm = 1.)


0



1, 0, 1152, 0, 221952, 0, 17282432, 0, 733189632, 0, 19804348032, 0, 375290947840, 201326592, 5335230402432, 21810380800, 59807438318592, 824432394240, 549355033319552, 17077528166400, 4260137204788992
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OFFSET

0,3


REFERENCES

J. SerraSagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 12 (2000), 3944.


LINKS

Table of n, a(n) for n=0..20.
J. H. Conway and N. J. A. Sloane, LowDimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 23692389 (pdf).


MAPLE

f := proc(m) local k, t1; t1 := 2^(n1)*binomial((n+2*m)/21, n1); if m mod 2 = 0 then t1 := t1+add(2^k*binomial(n, k)*binomial(m1, k1), k=0..n); fi; t1; end; where n=24.


CROSSREFS

Sequence in context: A098976 A154374 A114046 * A252438 A179689 A131527
Adjacent sequences: A035885 A035886 A035887 * A035889 A035890 A035891


KEYWORD

nonn


AUTHOR

Joan SerraSagrista (jserra(AT)ccd.uab.es)


EXTENSIONS

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


STATUS

approved



