This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (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 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=24. CROSSREFS Sequence in context: A098976 A154374 A114046 * A252438 A179689 A131527 Adjacent sequences:  A035885 A035886 A035887 * A035889 A035890 A035891 KEYWORD nonn AUTHOR Joan Serra-Sagrista (jserra(AT)ccd.uab.es) EXTENSIONS Recomputed by N. J. A. Sloane, Nov 27 1998 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 15 00:30 EST 2019. Contains 329988 sequences. (Running on oeis4.)