user: Question: How many season have an average attendance league of 2.456?
Columns: ['Season', 'Average Attendance Home', 'Highest Attendance Home', 'Average Attendance Away', 'Highest Attendance Away', 'Division / Section', 'Level', 'Average Attendance League']
Types: ['real', 'real', 'text', 'real', 'text', 'text', 'text', 'real']
Sample row: [2002.0, 7.546, '11.902 vs. Helsingborgs IF', 9.924, '24.570 vs. Malmö FF', 'Allsvenskan', 'Tier 1', 10.18]
SQL:

assistant: SELECT COUNT("Season") FROM "Table" WHERE "Average Attendance League" = 2.456;