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 A244889 #6 Nov 24 2018 08:15:08 %S A244889 1,-6,36,-229,1574,-11706,93831 %N A244889 Second column of triangle in A244888. %C A244889 Remmel (2014) asks for a formula. %H A244889 Jeffrey B. Remmel, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i3p2">Consecutive Up-down Patterns in Up-down Permutations</a>, Electron. J. Combin., 21 (2014), #P3.2. %Y A244889 Cf. A244888, A125273. %K A244889 sign,more %O A244889 2,2 %A A244889 _N. J. A. Sloane_, Jul 12 2014