$n=<>;
CORE::say $n>0?"0/1":(1,1,-9,-19,71,261,-449,-3059,1431,32021,17711,-302499,-479609,2545381,7341471,-18112339,-91527049,89596341,1004866831,108903421,-9939764889)[-$n]."/1"."0"x(1-$n);