OFFSET
1,2
COMMENTS
The author of the Mathematica program below uses the initial conditions a(1) = 1, a(2) = 3, and a(3) = 4. This is not necessary. We get the same sequence by using the initial conditions a(1) = 1 and a(2) = 3. - Petros Hadjicostas, Nov 15 2019
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..8193
MAPLE
a := proc(n) option remember; `if`(n < 3, [1, 3][n],
a(n - 1) + a(-2^ceil(log[2](n - 1)) + 2*n - 3))
end proc:
seq(a(n), n = 1..40); # Petros Hadjicostas, Nov 15 2019
MATHEMATICA
Fold[Append[#1, #1[[-1]] + #1[[#2]]] &, {1, 3, 4}, Flatten@Table[2 k - 1, {n, 5}, {k, 2^n}]] (* Ivan Neretin, Sep 07 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name edited by Petros Hadjicostas, Nov 15 2019
STATUS
approved