OFFSET
1,3
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..8193
MAPLE
a := proc(n) option remember;
if n < 4 then return [1, 1, 2][n]; end if;
a(n - 1) + a(2*n - 4 - Bits:-Iff(n - 2, n - 2)); end proc;
seq(a(n), n = 1 .. 50); # Petros Hadjicostas, Nov 08 2019
MATHEMATICA
Fold[Append[#1, #1[[-1]] + #1[[#2]]] &, {1, 1, 2}, Flatten@Table[2 k - 1, {n, 5}, {k, 2^n}]] (* Ivan Neretin, Sep 06 2015 *)
PROG
(PARI) lista(nn) = {nn = max(nn, 3); my(va = vector(nn)); va[1] = 1; va[2] = 1; va[3] = 2; for(n=4, nn, va[n] = va[n-1] + va[2*n - 3 - 2*2^logint(n-2, 2)]); va; } \\ Petros Hadjicostas, May 10 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name edited by Petros Hadjicostas, Nov 08 2019
STATUS
approved