Hi Eric,
If you don't have the symbolic toolbox you can do this numerically with the filter function which is part of basic Matlab, not exiled to a toolbox (so far so good).
function sN = fibon(n1,n2,N)
% the first N terms of a fibonacci series,
% where the first two terms are n1, n2.
% The traditional fibonacci series has n1 = n2 = 1.
x = zeros(1,N);
x(1) = 1;
a = [1 -1 -1];
b = [n1 n2-n1];
sN = filter(b,a,x)
end
This works up to N = 75 or so. After that, if you need more digits than supported by double precision, you can go to John D'Errico's high precision package in the file exchange, or something similar.
