Geodesic
On the number of Boolean functions in the Post classes $F_8^\mu$
Diskretnaya Matematika, Tome 11 (1999) no. 4, pp. 127-138.

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The problem of enumeration of all Boolean functions of $n$ variables of the rank $k$ from the Post classes $F^\mu_8$ is considered. This problem expressed in terms of the set theory is equivalent to the problem of enumeration of all $k$-families of different subsets of an $n$-set having the following property: any $\mu$ members of such a family have a non-empty intersection. A formula for calculating the cardinalities of these classes in terms of the graph theory is obtained. Explicit formulas for the cases $\mu=2$, $k\le 8$ (for $k\le 6$ they are given at the end of this paper), $\mu=3,4$, $k\le 6$, and for every $n$ were generated by a computer. As a consequence respective results for the classes $F^\mu_5$ are obtained. 
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     author = {V. Jovovi\'c and G. Kilibarda},
     title = {On the number of {Boolean} functions in the {Post} classes $F_8^\mu$},
     journal = {Diskretnaya Matematika},
     pages = {127--138},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1999_11_4_a10/}
}
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V. Jovović; G. Kilibarda. On the number of Boolean functions in the Post classes $F_8^\mu$. Diskretnaya Matematika, Tome 11 (1999) no. 4, pp. 127-138. http://geodesic.mathdoc.fr/item/DM_1999_11_4_a10/