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 A331159 #12 Jul 09 2025 04:50:44 %S A331159 1,4,16,74,419,2980,26566,289279,3726311 %N A331159 Number of GP-iposets (gluing-parallel posets with interfaces) with n points. %H A331159 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 A331159 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 A331159 The seven sequences in the table of Uli Fahrenberg et al., 2019, are A000112, A003430, A079566, A331156, A331157, A331158, A331159. %K A331159 nonn,more %O A331159 0,2 %A A331159 _N. J. A. Sloane_, Jan 16 2020, following a suggestion from _Michael De Vlieger_ %E A331159 a(7)-a(8) from _Uli Fahrenberg_, Jun 22 2021