It seems powerseries(1(a-b*t)^n, t, 0) produces an
error for n=2, but is correct for n=1,3,4:
(C1) POWERSERIES(1/(a-b*t)^2, t, 0);
INF ==== \ I1 - I1 - 2 I1
(D1) > a b (I1 + 1) t
I1 = 0
[I believe that powers of a and b above have opposite
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