SerieOUsLY!

$T_{n}=(11n+1)^2\\ \ddot\smile$

12 squared = 144 23 squared = 529 34 squared = 1156

we see 12 + 11 = 23 and 23 + 11= 34 Thus 34 + 11 = 45 And 45 squared = $2025$

Its very simple

144=12^2

529=(12*2-1)^2

1156=(12*3-2)^2

So,

(12*4-3)^2=2025