A python function Fun is designed to perform a certain matrix operation:

def FunSub(m,i,j):
    return [row[:j] + row[j+1:] for row in (m[:i]+m[i+1:])]

def Fun(m):
    if len(m) == 2:
        return m[0][0]*m[1][1]-m[0][1]*m[1][0]

    x = 0
    for c in range(len(m)):
        x += ((-1)**c)*m[0][c]*Fun(FunSub(m,0,c))
    return x

What inputs make Fun output 0?