|
| |
|
|
A019557
|
|
Coordination sequence for G_2 lattice.
|
|
2
| |
|
|
1, 12, 30, 48, 66, 84, 102, 120, 138, 156, 174, 192, 210, 228, 246, 264, 282, 300, 318, 336, 354, 372, 390, 408, 426, 444, 462, 480, 498, 516, 534, 552, 570, 588, 606, 624, 642, 660, 678, 696, 714, 732, 750, 768
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
REFERENCES
| R. Bacher, P. de la Harpe and B. Venkov, Series de croissance et series d'Ehrhart associees aux reseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
|
|
|
FORMULA
| a(n) = 18*n-6, n >= 1; G.f.: (1 + 10 x + 7 x^2)/(1-x)^2.
|
|
|
CROSSREFS
| Sequence in context: A135502 A125582 A031107 * A173107 A131874 A111396
Adjacent sequences: A019554 A019555 A019556 * A019558 A019559 A019560
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| mbaake(AT)sunelc3.tphys.physik.uni-tuebingen.de (Michael Baake)
|
| |
|
|
