Ok don't hurt yourself I'm here ...

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<h2>
n = 2</h2>
put 2 instead of any "n" you can see in the above equation


Oh can you see that " a(1) " we know what it is :

So :



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<h2>n = 3</h2>
put 3 instead of blablabla...


Oh we just found a(2) so :



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<h2>n = 4</h2>
put 4 ...

huh a(3)



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So the first four term of the sequence is :

There u go...
Have a great day ♡