|
|
A035757
|
|
Coordination sequence for C_20 lattice.
|
|
1
|
|
|
1, 800, 107200, 5831520, 174074240, 3339504032, 45443741760, 469398016480, 3866465104640, 26364054632480, 153196621856192, 776310358810720, 3494968152620160, 14192829714542240, 52645836542006080, 180251314603984608, 574703679819998720, 1719149109983644960, 4855892247909603520
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
|
|
FORMULA
|
a(n) = [x^(2n)] ((1+x)/(1-x))^20.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|