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A080687
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Number of labeled n-element posets with no 3-element antichain.
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0
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1, 1, 3, 18, 174, 2370, 41850, 908460, 23393160, 696752280, 23558056200, 891259815600, 37298874135600, 1710662148795600, 85319825069278800, 4597474487169564000, 266164417718126928000, 16475817276720193392000
(list; graph; refs; listen; history; internal format)
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