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Number of iposets (posets with interfaces) with n points.
4

%I #8 Jun 22 2021 08:13:55

%S 1,4,17,86,532,4068,38933,474822,7558620

%N Number of iposets (posets with interfaces) with n points.

%H Uli Fahrenberg, Christian Johansen, Georg Struth, Ratan Bahadur Thapa, <a href="https://arxiv.org/abs/1910.06162">Generating Posets Beyond N</a>, arXiv:1910.06162 [cs.FL], 2019.

%H Uli Fahrenberg, Christian Johansen, Georg Struth, Krzysztof ZiemiaƄski, <a href="https://arxiv.org/abs/2106.10895">Posets with Interfaces for Concurrent Kleene Algebra</a>, arxiv:2106.10895 [cs.FL], 2021.

%Y The seven sequences in the table of Uli Fahrenberg et al., 2019, are A000112, A003430, A079566, A331156, A331157, A331158, A331159.

%K nonn,more

%O 0,2

%A _N. J. A. Sloane_, Jan 16 2020, following a suggestion from _Michael De Vlieger_.

%E a(5)-a(8) from _Uli Fahrenberg_, Jun 22 2021