This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A331158 #10 Jul 09 2025 04:50:38 %S A331158 1,4,17,86,532,4068,38933,474822,7558620 %N A331158 Number of iposets (posets with interfaces) with n points. %H A331158 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 A331158 Uli Fahrenberg, Christian Johansen, Georg Struth, Krzysztof Ziemiański, <a href="https://arxiv.org/abs/2106.10895">Posets with Interfaces for Concurrent Kleene Algebra</a>, arxiv:2106.10895 [cs.FL], 2021. %Y A331158 The seven sequences in the table of Uli Fahrenberg et al., 2019, are A000112, A003430, A079566, A331156, A331157, A331158, A331159. %K A331158 nonn,more %O A331158 0,2 %A A331158 _N. J. A. Sloane_, Jan 16 2020, following a suggestion from _Michael De Vlieger_ %E A331158 a(5)-a(8) from _Uli Fahrenberg_, Jun 22 2021