OFFSET
0,1
LINKS
Rémy Sigrist, Table of n, a(n) for n = 0..1000
J. H. Conway, Integral lexicographic codes, Discrete Mathematics 83.2-3 (1990): 219-235. See Table 4.
FORMULA
Conjectures from Colin Barker, Jun 11 2020: (Start)
G.f.: (8 + 12*x + 11*x^2 + 13*x^3) / ((1 - 2*x)*(1 + 2*x)*(1 + 4*x^2)).
a(n) = 16*a(n-4) for n>3.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 08 2020.
EXTENSIONS
More terms from Rémy Sigrist, Jun 10 2020
STATUS
approved