In 2016, form 5695 had 30 lines -- in 2018 it only has 16. I'm not sure why you would not have page 2.
Page 2 of the 2016 form 5695 has the more common credits. It includes the addition of insulation, upgraded exterior doors, energy-efficient roof, and exterior windows. Line 30 is simply the result of filling out page 2. You can search for "2016 form 5695" to find a copy of the form. If nothing on page 2 applies to you, the amount on line 30 would be 0.
The amount on line 30 is transferred to line 53 of the form 1040 - so you could look at your 2016 form 1040 and possibly figure it out from that.