Forgot to mention

https://www.ams.org/journals/proc/1970-025-02/S0002-9939-1970-0253944-9/home.html

"""
The logarithm (base 2) of the number of distinct topologies on a set of elements is shown to be asymptotic to (n^2)/4 as n goes to infinity.
"""

and especially: https://oeis.org/A000798

https://en.wikipedia.org/wiki/On-Line_Encyclopedia_of_Integer_Sequences

On 29/04/2025 18:25, Martin Baker wrote:

Any ideas how I could check this out further?

Martin


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