OFFSET
0,2
COMMENTS
a(n) appears to be divisible by 2^n, with the factor 1, -1, 4, -55, 1264, -49468, 2790826, -218514586, 22522412176,.... - Ralf Stephan, Aug 14 2013
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved