SUCESIONES?

A)

<img src="https://tex.z-dn.net/?f=a_1%3D%281%2B1%29%5E2%3D2%5E2%3D4%20%5C%5C%20a_2%3D%20%282%2B1%29%5E2%3D3%5E2%3D9%20%5C%5Ca_3%3D%283%2B1%29%5E2%3D4%5E2%3D16%5C%20%5C%20...%20%5C%5C%20a_n%3D%28n%2B1%29%5E2" />

b)

<img src="https://tex.z-dn.net/?f=a_1%3D%283%2A1%29-1%3D3-1%3D2%20%5C%5C%20a_2%3D%283%2A2%29-1%3D6-1%3D5%20%5C%5C%20a_3%3D%283%2A3%29-1%3D9-1%3D8%20%5C%5C%20a_4%3D%283%2A4%29%20-1%3D12-1%3D11%5C%20%5C%20%5C%20...%20%5C%5C%20a_n%3D3n-1" />

Saludos.