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%I #25 Apr 11 2012 09:57:18
%S 9,48,236,1274,6489,30229,142320,711955,3601566
%N Number of distinct integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed.
%H Derek M. Jones, <a href="/A181959/a181959_1.r.txt">R program to generate list</a>
%H <a href="/index/Com#complexity">Index to sequences related to the complexity of n</a>
%e a(1)=48, the distinct values are -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 24 25 27 28 30 32 35 36 40 42 45 48 49 54 56 63 64 72 81
%Y Cf. A181898, A181957, A181958, A181960.
%K nonn
%O 0,1
%A _Derek M. Jones_, Apr 03 2012
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