1 in 1000 People Can Solve this Math Equation- Can You?

They say 1 in 1000 people can solve this math problem. For once, I actually got it right! Can you figure it out?

If you can't figure out the answer, or you want to check yours look below!

1+4=5

2+5+12

3+6=21

4+7=32

5+8=45

6+9=60

7+10=77

8+11= 96

Full article here, Good Housekeeping.