For the recurrence an=an−1+an−2a_n = a_{n-1} + a_{n-2}an=an−1+an−2 with a0=0,a1=1a_0 = 0, a_1 = 1a0=0,a1=1, what is the Wronskian W(n)=anan+2−an+12W(n) = a_n a_{n+2} - a_{n+1}^2W(n)=anan+2−an+12?
(−1)n(-1)^n(−1)n
111
000
(−1)n+1(-1)^{n+1}(−1)n+1