Number of Unlabeled Posets

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No. of Elements Number of Connected Posets Number of Disconnected Posets Total Number of Posets
1101
2112
3325
410616
5441963
623880318
71,6503952,045
814,5122,48716,999
9163,34119,890183,231
102,360,719206,5652,567,284
1143,944,9742,804,45346,749,427
121,055,019,09949,872,6471,104,891,746
1332,664,984,2381,158,843,21433,823,827,452
141,303,143,553,20535,049,606,5661,338,193,159,771
1566,900,392,672,1681,374,685,228,98868,275,077,901,156
164,413,439,778,321,68969,690,886,873,3984,483,130,665,195,087
17--4,554,367,168,841,547--