Alternating sum of the cubes of the first n Fibonacci numbers.

Terms

a(0) =0a(1) =-1a(2) =0a(3) =-8a(4) =19a(5) =-106a(6) =406a(7) =-1791a(8) =7470a(9) =-31834a(10) =134541a(11) =-570428a(12) =2415556a(13) =-10233781a(14) =43348852a(15) =-183632148a(16) =777872655a(17) =-3295130518a(18) =13958382186a(19) =-59128679555a(20) =250473067570