Calculer les premiers termes d'une suite explicite

$u_0 = 2$, $u_1 = -1$, $u_2 = 2$ et $u_3 = 17$

$u_0 = 2$, $u_1 = -1$, $u_2 = 2$ et $u_3 = -17$

$u_0 = -22$ et $u_1 = 1$, $u_2 = -1$ et $u_3 = -1$