F_n+1 = F_n + F_n-1 with F_0 = 0, F_1 = 1. Closed-form Binet F_n = (φ^n - ψ^n)/√5 where φ = (1+√5)/2 golden ratio. Limiting ratio F_n+1/F_n → φ. Appears in phyllotaxis, art (Parthenon), continued fractions ([1;1,1,...]).
F_n+1 = F_n + F_n-1 with F_0 = 0, F_1 = 1. Closed-form Binet F_n = (φ^n - ψ^n)/√5 where φ = (1+√5)/2 golden ratio. Limiting ratio F_n+1/F_n → φ. Appears in phyllotaxis, art (Parthenon), continued fractions ([1;1,1,...]).