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

0,3

Links

Table of n, a(n) for n=0..9.

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

Equals A260685(2^n).

Sequence in context: A306021 A122593 A267348 * A153450 A179389 A084123

Adjacent sequences: A264607 A264608 A264609 * A264611 A264612 A264613

Keyword

sign

Author

N. J. A. Sloane, Nov 25 2015

Status

approved