|
|
A035767
|
|
Coordination sequence for C_30 lattice.
|
|
1
|
|
|
1, 1800, 541200, 65520920, 4296107040, 177923724072, 5119703270960, 109262828065080, 1814077233023040, 24302419569598280, 270376971905976912, 2557028677258648920, 20954617154922097760, 151203821860764511080, 973794385663429365360, 5662556669152122153336
(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))^30.
|
|
PROG
|
(PARI) a(n) = polcoeff(Pol(((1+x)/(1-x))^30+O(x^(2*n+1))), 2*n); \\ Michel Marcus, Jul 07 2018
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|