Puzzles/Easy Sequence 8/Solution
This series is represented by the months. If the month has 31 days, it gets a one. If not, it gets a zero.
|Length||31||28 or 29||31||30||31||30||31||31||30||31||30||31|
Alternatively, it can be described as the remainder after dividing by 2 of the length of each month in a common year (as opposed to a leap year).