OFFSET
0,3
LINKS
N. J. A. Sloane, Transforms
Eric Weisstein's World of Mathematics, Pell Number
Index entries for linear recurrences with constant coefficients, signature (6,-5,-6,-1).
FORMULA
G.f.: x*(1 - 2*x - x^2)/(1 - 6*x + 5*x^2 + 6*x^3 + x^4).
a(n) = 6*a(n-1) - 5*a(n-2) - 6*a(n-3) - a(n-4).
MATHEMATICA
CoefficientList[Series[x (1 - 2 x - x^2)/(1 - 6 x + 5 x^2 + 6 x^3 + x^4), {x, 0, 27}], x]
LinearRecurrence[{6, -5, -6, -1}, {0, 1, 4, 18}, 28]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ilya Gutkovskiy, Dec 09 2016
STATUS
approved