CREATE TABLE table_61887 ("Round" TEXT, "Clubs remaining" FLOAT, "Clubs involved" FLOAT, "Winners from previous round" TEXT, "New entries this round" TEXT)

What are the clubs involved with 16 clubs remaining?
SELECT "Clubs involved" FROM table_61887 WHERE "Clubs remaining" = '16'
SELECT "Clubs involved" FROM "table_61887" WHERE "Clubs remaining" = '16'