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A105974
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(A001035(n) - 1)/2 where A001035 is the number of partially ordered sets ("posets") with n labeled elements.
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0
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0, 0, 1, 9, 109, 2115, 65011, 3064929, 215861689, 22255521255, 3305532624391, 698140838552949, 207432475527926749, 85925364190793529675, 49242162128564103516091, 38783585510220344176524969
(list; graph; refs; listen; history; internal format)
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