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

%I #5 Jan 16 2020 14:13:23

%S 1,2,5,16,66,350

%N Number of iposets (posets with interfaces) with starting interfaces only, 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.

%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_.