OFFSET
2,10
COMMENTS
-(-1)^n*a(n) is the number of inequivalent elements of norm -n in Z[sqrt{3}].
LINKS
Jeremy Lovejoy, Overpartitions and real quadratic fields, J. Number Theory, 106 (2004), 178-186.
CROSSREFS
KEYWORD
sign
AUTHOR
Jeremy Lovejoy, Jun 12 2009
STATUS
approved