Number of topologies on n labeled elements in which no element belongs to any pair of noncomparable members of the topology.
1, 1, 4, 19, 112, 811, 7024, 70939, 818752, 10630891, 153371344, 2433948859
3 seqfan posts
Sun Jan 2 11:37:41 CET 2011 [seqfan] Re: Possible closed form for A122835
Sun Jan 2 11:37:41 CET 2011 [seqfan] Re: Possible closed form for A122835
Sat Jan 1 18:49:43 CET 2011 [seqfan] Possible closed form for A122835
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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