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A327016 BII-numbers of finite T_0 topologies without their empty set.

Table of values

n a(n)
1 0
2 1
3 2
4 5
5 6
6 7
7 8
8 17
9 24
10 25
11 34
12 40
13 42
14 69
15 70
16 71
17 81
18 85
19 87
20 88
21 89
22 93
23 98
24 102
25 103
26 104
27 106
28 110
29 120
30 121
31 122
32 127
33 128
34 257
35 384
36 385
37 514
38 640
39 642
40 1029
41 1030
42 1031
43 1281
44 1285
45 1287
46 1408
47 1409
48 1413
49 1538
50 1542
51 1543
52 1664
53 1666
54 1670
55 1920

List of values

[0, 1, 2, 5, 6, 7, 8, 17, 24, 25, 34, 40, 42, 69, 70, 71, 81, 85, 87, 88, 89, 93, 98, 102, 103, 104, 106, 110, 120, 121, 122, 127, 128, 257, 384, 385, 514, 640, 642, 1029, 1030, 1031, 1281, 1285, 1287, 1408, 1409, 1413, 1538, 1542, 1543, 1664, 1666, 1670, 1920]