login
A169719
Theta series of extremal lattice of dimension 14, level 7 and minimal norm 6.
0
1, 0, 0, 560, 2394, 9072, 26824, 71136, 158004, 306432, 599256, 1034208, 1784328, 2849616, 4489776, 6664896, 9985374, 14200704
OFFSET
0,4
COMMENTS
The lattice has Gram matrix:
6
-2 6
2 -3 6
-3 0 1 6
-3 1 -2 3 6
-1 3 0 2 0 6
-1 2 -3 1 3 2 6
2 -2 0 -3 -3 -3 -3 6
-3 3 -1 1 1 3 0 -1 6
2 1 0 0 -2 1 1 1 -2 6
-2 3 0 1 2 2 2 -3 1 -1 6
-3 3 0 2 1 2 -1 -1 2 0 2 6
-3 3 -3 1 3 2 3 -2 3 0 1 2 6
2 1 2 -2 -1 1 0 -1 1 -1 1 0 -1 6
REFERENCES
Scharlau, Rudolf and Schulze-Pillot, Rainer, Extremal lattices, in Algorithmic algebra and number theory (Heidelberg, 1997), 139-170, Springer, Berlin, 1999. [Here the existence of such a lattice is left open.]
EXAMPLE
1 + 560*q^3 + 2394*q^4 + 9072*q^5 + 26824*q^6 + 71136*q^7 + 158004*q^8 + 306432*q^9 + 599256*q^10 + 1034208*q^11 + 1784328*q^12 + 2849616*q^13 + 4489776*q^14 + 6664896*q^15 + 9985374*q^16 + 14200704*q^17 + O(q^18)
CROSSREFS
Sequence in context: A260290 A249839 A069243 * A104591 A318119 A364151
KEYWORD
nonn
AUTHOR
Boris Hemkemeier (bhemkemeier(AT)googlemail.com) and Rudolf Scharlau (Rudolf.Scharlau(AT)math.uni-dortmund.de), Apr 21 2010
STATUS
approved