|
|
A035894
|
|
Coordination sequence for diamond structure D^+_36. (Edges defined by l_1 norm = 1.)
|
|
1
|
|
|
1, 0, 2592, 0, 1121472, 0, 194986080, 0, 18300435840, 0, 1080041397408, 0, 44042615547456, 0, 1323529602867936, 0, 30721376739859200, 0, 570951082378155808, 1236950581248, 8740628929823039424
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
Index entries for linear recurrences with constant coefficients, signature (0, 36, 0, -630, 0, 7140, 0, -58905, 0, 376992, 0, -1947792, 0, 8347680, 0, -30260340, 0, 94143280, 0, -254186856, 0, 600805296, 0, -1251677700, 0, 2310789600, 0, -3796297200, 0, 5567902560, 0, -7307872110, 0, 8597496600, 0, -9075135300, 0, 8597496600, 0, -7307872110, 0, 5567902560, 0, -3796297200, 0, 2310789600, 0, -1251677700, 0, 600805296, 0, -254186856, 0, 94143280, 0, -30260340, 0, 8347680, 0, -1947792, 0, 376992, 0, -58905, 0, 7140, 0, -630, 0, 36, 0, -1).
|
|
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=36.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|