Pell numbers are a mathematical sequence of numbers that help approximate the value of v2 (check out the page on Pell Numbers: ttps://en.wi dia.org/wiki/Pell _number). The sequence is defined recursively as shown in eq. 1 0 If n = 0 2P,-1+Pn-2 if n > 1 Write a function called pell that takes one integer parameter n, of type int. If n is negative, pell returns pell returns the nth Pell number (ie, P,2) >pellCO) >pell (1) >pell (2) 2 >pell (3) >>>pell(-45) >pell (6) 70