%I A054516
%S A054516 0,2,2,6,4,50,258,1862,14824,133506,1334950,14684582,176214828,
%T A054516 2290792946,32071101034,481066515750,7697064251728,130850092279682,
%U A054516 2355301661033934,44750731559645126,895014631192902100
%V A054516 0,2,2,6,-4,50,-258,1862,-14824,133506,-1334950,14684582,-176214828,
%W A054516 2290792946,-32071101034,481066515750,-7697064251728,130850092279682,
%X A054516 -2355301661033934,44750731559645126,-895014631192902100
%N A054516 Equivalent of the Kurepa hypothesis for left factorial.
%D A054516 A. Petojevic, M.Zizovic, Trees and the Kurepa hypothesis for left factorial, 
               Filomat (Nis), (1999), 31-40.
%F A054516 a(3)=0, a(n)= -(n-3)*a(n-1) + (n-3)*(n-2)
%Y A054516 Sequence in context: A061807 A062885 A062293 this_sequence A062400 A064766 
               A121178
%Y A054516 Adjacent sequences: A054513 A054514 A054515 this_sequence A054517 A054518 
               A054519
%K A054516 sign,easy
%O A054516 3,2
%A A054516 Aleksandar Petojevic (apetoje(AT)ptt.yu), Apr 09 2000
%E A054516 More terms from James A. Sellers (sellersj(AT)math.psu.edu), Apr 09 2000