OFFSET
0,2
COMMENTS
Also a diagonal close to the top of A129392.
LINKS
Index entries for linear recurrences with constant coefficients, signature (-2, -1, 4).
FORMULA
Conjectures from Colin Barker, Oct 07 2015: (Start)
a(n) = -2*a(n-1) - a(n-2) + 4*a(n-3) for n>2.
G.f.: (4*x^2-7*x-1) / ((x-1)*(4*x^2+3*x+1)).
(End)
MATHEMATICA
CoefficientList[Series[(4x^2-7x-1)/((x-1)(4x^2+3x+1)), {x, 0, 40}], x] (* or *) LinearRecurrence[{-2, -1, 4}, {1, 5, -15}, 40] (* Harvey P. Dale, Apr 01 2023 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Jonas Wallgren, Apr 13 2007
EXTENSIONS
More terms from R. J. Mathar, Apr 30 2007
STATUS
approved