sage: f = y(n+2) - y(n+1) - y(n)
sage: rsolve(f, y(n), { y(0):1, y(1):1 })
(1/2 + 5**(1/2)/2)**n/2 + (1/2 - 5**(1/2)/2)**n/2 - 5**(1/2)*(1/2 -
5**(1/2)/2)**n/10 + 5**(1/2)*(1/2 + 5**(1/2)/2)**n/10

That's perfect !! Thank you very much !! :-)

Their interface is a bit clumsy though, I admit... It could be good to
be able to do it directly in Sage :-)

Nathann

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