CREATE TABLE table_53122 ("City district" TEXT, "Area km\\u00b2" TEXT, "Population 2007 census ( hab ) " TEXT, "Housing  ( 2007 ) " TEXT, "Density  ( hab/km\\u00b2 ) " TEXT, "Elevation msl" TEXT)

What is the density of San Sebasti n?
SELECT "Density (hab/km\u00b2)" FROM table_53122 WHERE "City district" = 'san sebastián'
SELECT "Density (hab/km\u00b2)" FROM "table_53122" WHERE "City district" = 'san sebastián'