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%I #9 Sep 30 2013 12:57:41
%S -1,-2,-4,-9,-29,-85,-311,-1549,-9851,-74587,-956633
%N The negative number of minimum absolute value not obtainable from 1 in n steps using addition, multiplication, and subtraction.
%C This is similar to A141414 but applied to negative numbers. It is the greatest negative number that requires an n step SLP (Stright Line Program) to compute it.
%e For n=1 the value is -1 since -1 requires 2 steps SLP: 1,2,-1.
%e For n=2 the value is -2 since -2 requires 3 steps SLP: 1,2,3,-2.
%e For n=3 the value is -4 since -3 also requires only 3 steps but -4 requires 4: 1,2,4,5,-4.
%Y Cf. A141414, A216999, A214872.
%K sign,hard
%O 0,2
%A _Gil Dogon_, Sep 27 2013
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