Geodesic
The number of labeled topologies on nine points
Zapiski Nauchnykh Seminarov POMI, Rings and linear groups, Tome 75 (1978), pp. 35-42

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The number of all topologies which can be introduced on a fixed set of nine points is found. It is equal to 63 260 289 423. Of them 44 511 042 511 are topologies with the axiom of separability $\mathrm T_\mathrm o$. Bibl. 3 titles. 
@article{ZNSL_1978_75_a4,
     author = {Z. I. Borevich and V. Venslav and \'E. Dobrovol'skii and V. I. Rodionov},
     title = {The number of labeled topologies on nine points},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {35--42},
     publisher = {mathdoc},
     volume = {75},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_75_a4/}
}
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Z. I. Borevich; V. Venslav; É. Dobrovol'skii; V. I. Rodionov. The number of labeled topologies on nine points. Zapiski Nauchnykh Seminarov POMI, Rings and linear groups, Tome 75 (1978), pp. 35-42. http://geodesic.mathdoc.fr/item/ZNSL_1978_75_a4/