OFFSET
0,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (6, -6, 6, -1)
FORMULA
G.f.: (1 + x^2)/(1 - 6 x + 6 x^2 - 6 x^3 + x^4).
a(n) = 6*a(n-1) - 6*a(n-2) + 6*a(n-3) - a(n-4).
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Aug 10 2017
STATUS
approved