|
|
A035777
|
|
Coordination sequence for C_40 lattice.
|
|
1
|
|
|
1, 3200, 1708800, 366366080, 42340840960, 3070951360128, 153524473002240, 5639746542798720, 159505036253752320, 3599066875202445440, 66639047280436354816, 1035866362657624498560, 13775860435151438471680
(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))^40.
|
|
MAPLE
|
seq(coeff(series(((1+x)/(1-x))^40, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|