<Tr> <Td> i = 1 </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> <Tr> <Td> i = − 1 </Td> </Tr> <Tr> <Td>... (repeats the pattern from the blue area) </Td> </Tr>

The value of where i is the imaginary unit is