A284762 - cp's OEIS frontend

A284762 Total number of subsets of X that are open and closed and connected summed over all distinct topological spaces X that can be placed on an n-set.

n	a(n)
0	1
1	2
2	9
3	69
4	852
5	16363
6	479435
7	21150888
8	1388124543
9	133822887673
10	18707633394606
11	3745998552621317
12	1062675319801676431
13	423005074717335908762
14	234301896939296139079453
15	179277553685814268284430793
16	188286118651948743843774496644
17	269901723843412313246289232355847
18	525443899393186663528068248469425039

[1, 2, 9, 69, 852, 16363, 479435, 21150888, 1388124543, 133822887673, 18707633394606, 3745998552621317, 1062675319801676431, 423005074717335908762, 234301896939296139079453, 179277553685814268284430793, 188286118651948743843774496644, 269901723843412313246289232355847, 525443899393186663528068248469425039]

cp's OEIS Frontend

A284762 Total number of subsets of X that are open and closed and connected summed over all distinct topological spaces X that can be placed on an n-set.

Table of values

List of values