login
A190968
a(n) = 4*a(n-1) - 10*a(n-2), with a(0)=0, a(1)=1.
2
0, 1, 4, 6, -16, -124, -336, -104, 2944, 12816, 21824, -40864, -381696, -1118144, -655616, 8558976, 40792064, 77578496, -97606656, -1166211584, -3688779776, -3093003264, 24515784704, 128993171456, 270814838784, -206672359424, -3534837825536, -12072627707904
OFFSET
0,3
LINKS
Beata Bajorska-Harapińska, Barbara Smoleń, and Roman Wituła, On Quaternion Equivalents for Quasi-Fibonacci Numbers, Shortly Quaternaccis, Advances in Applied Clifford Algebras (2019) Vol. 29, 54.
FORMULA
G.f.: x/(1 - 4*x + 10*x^2). - Philippe Deléham, Oct 12 2011
MATHEMATICA
LinearRecurrence[{4, -10}, {0, 1}, 50]
CROSSREFS
Cf. A190958 (index to generalized Fibonacci sequences).
Sequence in context: A223357 A083009 A365111 * A127416 A306017 A226631
KEYWORD
sign
AUTHOR
STATUS
approved