cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A122836 Number of topologies on n labeled elements in which at least one element belongs to some pair of noncomparable members of the topology.

Table of values

n a(n)
0 0
1 0
2 0
3 10
4 243
5 6131
6 202503
7 9464302
8 641960602
9 63249658532
10 8976900501699
11 1816843604787333
12 519355528928422629
13 207881392866381430470
14 115617051961092253351796
15 88736269118240819706018342
16 93411113411702066083187522063
17 134137950093337685116171325021995
18 261492535743634369726764132015849219

List of values

[0, 0, 0, 10, 243, 6131, 202503, 9464302, 641960602, 63249658532, 8976900501699, 1816843604787333, 519355528928422629, 207881392866381430470, 115617051961092253351796, 88736269118240819706018342, 93411113411702066083187522063, 134137950093337685116171325021995, 261492535743634369726764132015849219]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.