OFFSET
4,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 4..1000
FORMULA
a(n) = floor(A001333(n) / 10). - Andrew Howroyd, Jan 02 2020
Conjectures from Colin Barker, Jan 03 2020: (Start)
G.f.: x^4*(1 + x - 2*x^2 + x^3 + x^4) / ((1 - x)*(1 + x^2)*(1 - 2*x - x^2)*(1 - x^2 + x^4)).
a(n) = 3*a(n-1) - a(n-2) - a(n-3) - a(n-6) + 3*a(n-7) - a(n-8) - a(n-9) for n>12.
(End)
MATHEMATICA
Table[Floor[(((1 - Sqrt[2])^n + (1 + Sqrt[2])^n)/2)/10], {n, 4, 29}] (* Metin Sariyar, Jan 03 2020 *)
PROG
(PARI) a(n)={polcoef((1 - x) / (1 - 2*x - x^2) + O(x*x^n), n)\10} \\ Andrew Howroyd, Jan 02 2020
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Paul Curtz, Oct 02 2007
EXTENSIONS
Offset changed and terms a(24) and beyond from Andrew Howroyd, Jan 02 2020
STATUS
approved