OFFSET
1,2
COMMENTS
a(n+1)/a(n)-> 2.
Appears to be the same as A052968 (apart from the offset). - R. J. Mathar, Jun 14 2017
This conjecture is proved in A288381. - Michel Dekking, Feb 18 2021
FORMULA
a(n) = -1 + A288133(n-1) for n >= 2.
Conjectures from Colin Barker, Jun 10 2017: (Start)
G.f.: x*(1 - 2*x + x^3 - x^4) / ((1 - x)^2*(1 - 2*x)).
a(n) = -1 + 2^(n-3) + n for n>2.
a(n) = 4*a(n-1) - 5*a(n-2) + 2*a(n-3) for n>5.
(End)
Barker's conjectures are implied by Mathar's conjecture. - Michel Dekking, Feb 18 2021
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jun 10 2017
STATUS
approved