OFFSET
1,2
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..8193
MATHEMATICA
Fold[Append[#1, #1[[-1]] + #1[[#2]]] &, {1, 3, 4}, Flatten@Table[2 k, {n, 5}, {k, 2^n}]] (* Ivan Neretin, Sep 07 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved