1, 5, 14, 30, 50, 55, 91?

The pattern is
1² ,
1² + 2²,
1² + 2² + 3²,
1² + 2² + 3² + 4²,
1² + 2² + 3² + 4² + 5²,
1² + 2² + 3² + 4² + 5² + 6² .
But 50 is not of this pattern.