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 A331157 #7 Jul 09 2025 04:50:31 %S A331157 1,2,5,16,66,350 %N A331157 Number of iposets (posets with interfaces) with starting interfaces only, with n points. %H A331157 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 A331157 The seven sequences in the table of Uli Fahrenberg et al., 2019, are A000112, A003430, A079566, A331156, A331157, A331158, A331159. %K A331157 nonn,more %O A331157 0,2 %A A331157 _N. J. A. Sloane_, Jan 16 2020, following a suggestion from _Michael De Vlieger_