FIBONACCI
1, 1, 2, 3, 5, 8, 13, 21, 34, 55...
F(10) = 55
φ ≈ 1.618
Fₙ = Fₙ₋₁ + Fₙ₋₂
1, 1, 2, 3, 5, 8, 13…