I was wondering if this sequence was possible using two base cases? The sequence is $\{-1,0,1,3,13\}$ .. Ive came close by doing $(a_{n-1})^2+a_{n-2}+a_n-1$ which works for everything but the $1$. I'm jumping around the right answer but can't seem to get it.
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Solution To the relation is: n*a(n-1)+(a(n-2))^2 – user3791401 Nov 06 '14 at 18:59