a(n) = Fibonacci(n-1)^2 - Fibonacci(n)^2.

Terms

a(0) =-1a(1) =0a(2) =-3a(3) =-5a(4) =-16a(5) =-39a(6) =-105a(7) =-272a(8) =-715a(9) =-1869a(10) =-4896a(11) =-12815a(12) =-33553a(13) =-87840a(14) =-229971a(15) =-602069a(16) =-1576240a(17) =-4126647a(18) =-10803705a(19) =-28284464a(20) =-74049691a(21) =-193864605a(22) =-507544128a(23) =-1328767775a(24) =-3478759201a(25) =-9107509824a(26) =-23843770275a(27) =-62423800997a(28) =-163427632720