Trick of Mind

A couple of sequences to extend, based on similar principles…
4 – 9 – 49 – 144 – 441 – ??? – ???
4 – 484 – 28224 – 228484 – 8282884 – ???
Feel free to extend the sequence further if you wish…

Whilst I was away under the pretense of work, a nearby bank uncovered a plot to swap the gold in their vaults with counterfeits. It was determined that all the gold bars in three of the Bank’s seven vaults were replaced with counterfeits. The other four vaults were uncompromised. The plot was foiled through the [...]