Somos' quadratic recurrence constant

The constant associated with Somos' quadratic recurrence, often denoted as \( c \), is given by the formula: \[ c = \frac{1 + \sqrt{5}}{2} \] This is known as the golden ratio, commonly denoted by \( \phi \). In the context of the recurrence, the sequence defines terms using the previous terms in relation to this constant.