OFFSET
0,1
COMMENTS
See A054871 for definitions and key links.
Sequence is also the decimal expansion of 2989/9000.
LINKS
FORMULA
From Elmo R. Oliveira, Jul 16 2024: (Start)
G.f.: (3-x^2-x^3)/(1-x).
a(n) = 1 for n >= 3. (End)
E.g.f.: exp(x) + 2 + 2*x + x^2/2. - Elmo R. Oliveira, Aug 09 2024
EXAMPLE
a(0) = H_0(1,2) = 2+1 = 3;
a(1) = H_1(1,2) = 1+2 = 3;
a(2) = H_2(1,2) = 1*2 = 2;
a(3) = H_3(1,2) = 1^2 = 1;
a(4) = H_4(1,2) = 1^^2 = 1.
CROSSREFS
KEYWORD
AUTHOR
Natan Arie Consigli, Aug 24 2015
STATUS
approved