|
Search: id:A008394
|
|
|
| A008394 |
|
Crystal ball sequence for A_9 lattice. |
|
+0
3
|
|
| 1, 91, 2161, 24691, 176251, 907753, 3685123, 12494233, 36808723, 96918753, 232834755, 518344905, 1082218305, 2139007755, 4032416505, 7294752507, 12726601437, 21501506127, 35301145037, 56487256007
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Comment from T. D. Noe, Apr 29 2007: For the formula to produce this sequence, the four minus signs should be pluses and a 1 should be added: 2431/18144*n^9+2431/4032*n^8+4433/1512*n^7+715/96*n^6+67067/4320*n^5+4147/192*n^4+197329/9072*n^3+14465/1008*n^2+7129/1260*n+1;
Comment from njas, May 04 2007: In that case I need to recheck both the formula and the values to see which is correct.
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n=0..1000
Index entries for crystal ball sequences
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
|
|
MAPLE
|
2431/18144*n^9-2431/4032*n^8+4433/1512*n^7+67067/4320*n^5+197329/9072*n^3+7129/1260*n-715/96*n^6-4147/192*n^4-14465/1008*n^2;
|
|
CROSSREFS
|
Sequence in context: A140667 A118706 A119150 this_sequence A133416 A047697 A096054
Adjacent sequences: A008391 A008392 A008393 this_sequence A008395 A008396 A008397
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas and J. H. Conway (conway(AT)math.princeton.edu)
|
|
|
Search completed in 0.002 seconds
|
