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A035778 Coordination sequence for C_41 lattice. 1
1, 3362, 1886082, 424744994, 51545165314, 3924107038242, 205809135461250, 7926934099341090, 234899820107413506, 5549249810903210786, 107487307512919088002, 1746399693272455238178, 24253916252710687817218 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
R. Bacher, P. de la Harpe and B. Venkov, Séries de croissance et séries d'Ehrhart associées aux réseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
FORMULA
a(n) = [x^(2n)] ((1+x)/(1-x))^41.
MAPLE
seq(coeff(series(((1+x)/(1-x))^41, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018
CROSSREFS
Cf. A035736.
Sequence in context: A207132 A175534 A233356 * A108002 A221332 A163044
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved

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Last modified March 4 11:14 EST 2024. Contains 370528 sequences. (Running on oeis4.)