You are the division winner so you face all of the other division winners in your conference.
Every year a nfl team will play 6 division games.
all 4 teams in an afc division
all 4 teams in an Nfc divsion
and the 2 teams that finished in the same position within their division as that team in the same conference.
(predetermined) Seattle faces all NFC west teams at home and away. (6 games)
(predetermined)All afc west teams (4games)
(predetermined)All nfc east teams (4games)
and the winners of the nfc north and nfc south (because they won the nfc west)
San fran finished 2nd in the division so they will face the second place nfc north and nfc south teams.