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A026904
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Number of sets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function; e.g. a(2)=2 counts {1,11},{1,2,3}.
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0
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0, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 3, 1, 3, 2, 2, 2, 3, 2, 4, 2, 2, 3, 4, 1, 4, 3, 3, 3, 4, 3, 4, 2, 3
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