OFFSET
0,3
MAPLE
f:=proc(n) option remember;
if n=0 then 1 else -add(f(n-i)^(2^i), i=1..n); fi; end;
[seq(f(n), n=0..4)];
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Nov 25 2015
STATUS
approved