|
Search: id:A035912
|
|
|
| A035912 |
|
Coordination sequence for diamond structure D^+_72. (Edges defined by l_1 norm = 1.) |
|
+0
1
|
|
| 1, 10368, 17922816, 12407366016, 4610216314368, 1068744800817792, 169506887987474688, 19580193687475702656, 1723599538143585831936, 119669709626799156403328, 6733021714697626592585472, 313769325989254807329936768
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
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 (Abstract, pdf, ps).
|
|
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=72.
|
|
CROSSREFS
|
Adjacent sequences: A035909 A035910 A035911 this_sequence A035913 A035914 A035915
Sequence in context: A083438 A097695 A031803 this_sequence A104439 A031866 A010082
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
J. Serra-Sagrista (jserra(AT)ccd.uab.es) Recomputed by njas Nov 27 1998.
|
|
|
Search completed in 0.002 seconds
|
