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 A293498 #10 Jan 08 2018 02:58:17 %S A293498 1,2,5,14,42,132,426,1390,4544,14822,48183,156118,504487,1627000, %T A293498 5240019,16861453,54228190,174351450,560481708,1801653769,5791301311, %U A293498 18615976402,59841686254,192366897839,618392292337 %N A293498 Number of unlabeled semiorders on n points and having dimension at most 2. %H A293498 Mitchel T. Keller, Stephen J. Young, <a href="https://arxiv.org/abs/1801.00501">Hereditary Semiorders and Enumeration of Semiorders by Dimension</a>, arXiv:1801.00501 [math.CO], 2018. %H A293498 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (12,-61,172,-294,311,-197,66,-7). %F A293498 G.f.: -x*(5*x^7 - 41*x^6 + 101*x^5 - 129*x^4 + 96*x^3 - 42*x^2 + 10*x - 1)/(7*x^8 - 66*x^7 + 197*x^6 - 311*x^5 + 294*x^4 - 172*x^3 + 61*x^2 - 12*x + 1). %K A293498 nonn,easy %O A293498 1,2 %A A293498 _Mitchel T. Keller_, Oct 10 2017