OFFSET
0,3
LINKS
Flavien Mabilat, Some counting formulas for λ-quiddities over the rings Z / 2^m Z, arXiv:2402.09968 [math.CO], 2024.
FORMULA
a(n+1) = (2/3)*(-1)^n*((-8)^n-4^n).
O.g.f.: 1 - 8*x^2/(32*x^2+4*x-1).
a(n) = 8 * A091904(n-1). - R. J. Mathar, Jun 28 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jacob A. Siehler, Apr 07 2009
EXTENSIONS
Offset corrected by R. J. Mathar, Jun 28 2009
Offset changed back and a(0) = 1 prepended by Andrey Zabolotskiy, Feb 21 2024
STATUS
approved