CREATE TABLE table_18018 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "Attendance" FLOAT)

What week did the Seahawks play at los angeles memorial coliseum?
SELECT MIN("Week") FROM table_18018 WHERE "Game site" = 'Los Angeles Memorial Coliseum'
SELECT MIN("Week") FROM "table_18018" WHERE "Game site" = 'Los Angeles Memorial Coliseum'