A264610 a(0)=1; thereafter a(n) = -Sum_{i=1..n} a(n-i)^(2^i).

1, -1, -2, -6, -54, -4470, -30229110, -1388162822415990, -2926650008246700930753649260150, -13001299396349738096788020339357180951040927696209747704510070

Offset: 0

Author

N. J. A. Sloane, Nov 25 2015

Keywords

• sign

Crossrefs

Equals A260685(2^n).

Programs

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)];