OFFSET
1,3
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..2000
FORMULA
G.f.: -((x (1 + x) (1 + x^2) (1 + 2 x + 3 x^2 + 2 x^3 + 2 x^4 + 2 x^5 +
2 x^6))/((1 + x + x^2) (-1 + x^3 + x^6)))
MATHEMATICA
Union[# - 1, #, # + 1] &[LucasL[Range[50]]]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling and Peter J. C. Moses, Jul 01 2015
STATUS
approved