What’s the next element of the sequence?

Recently I have been applying for the summer internships and one of the recruitment processes has really surprised me. I have submitted an application, I have been asked to take an online aptitude test, finally I have been invited for an interview and a set of tests in company’s office. Everything is fine so far, but things started to change on the day I visited the office – when I was given one of the tests. The whole test was about guessing what is the next element in the sequence!