<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="2"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewership ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 16 </Td> <Td colspan="1"> January 21 , 2016 ( 2016 - 01 - 21 ) </Td> <Td> May 19 , 2016 ( 2016 - 05 - 19 ) </Td> <Td> 135 </Td> <Td> 3.16 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 17 </Td> <Td colspan="1"> October 13 , 2016 ( 2016 - 10 - 13 ) </Td> <Td> April 4 , 2017 ( 2017 - 04 - 04 ) </Td> <Td> 141 </Td> <Td> 2.57 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 18 </Td> <Td colspan="1"> October 10 , 2017 ( 2017 - 10 - 10 ) </Td> <Td> April 9 , 2018 ( 2018 - 04 - 09 ) </Td> <Td> 170 </Td> <Td> 2.24 </Td> </Tr> </Table>
<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="2"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewership ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 16 </Td> <Td colspan="1"> January 21 , 2016 ( 2016 - 01 - 21 ) </Td> <Td> May 19 , 2016 ( 2016 - 05 - 19 ) </Td> <Td> 135 </Td> <Td> 3.16 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 17 </Td> <Td colspan="1"> October 13 , 2016 ( 2016 - 10 - 13 ) </Td> <Td> April 4 , 2017 ( 2017 - 04 - 04 ) </Td> <Td> 141 </Td> <Td> 2.57 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 18 </Td> <Td colspan="1"> October 10 , 2017 ( 2017 - 10 - 10 ) </Td> <Td> April 9 , 2018 ( 2018 - 04 - 09 ) </Td> <Td> 170 </Td> <Td> 2.24 </Td> </Tr> </Table>
how many episodes in season 1 of legends of tomorrow
how many episodes in season 1 of legends of tomorrow
16
16