The triangles would be congruent, because the lines GH and FI are congruent and the angle H and I are the same, and since the line HI is shared by the two, it would then be SAS.
Let's take a look at the first few numbers in the sequence based on the given rule:
Inspecting this pattern it seems like the power is being raised to is always one less than the number of the sequence, so if we were on the nth number in the sequence, that part of the expression would be . We also know that we'll be multiplying whatever we get from that by 6, so we can write the full explicit rule for our sequence as