Hi guys, I'm doing some exercises in which given a recursive sequence and its first term, I have to find the general formula/term. I am stuck in two and I would like some help. Thanks in advance. Now, the sequences: 1) a1=1, an+1= an + ((-1)^(n+1))n^2 So, the first terms are: a2=2, a3=-2, a4=7, a5=-9, a6=16 Maybe you find it easy, I've been trying really hard to come up with the formula but I haven't got a clue. 2) a1=1, an+1= an + n^3 So, the first ones are: a2=2, a3=10, a4=37, a5=101 And again, no idea. I suck at this, sorry to bother you but I would really appreciate your help.