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 A373754 #10 Jun 17 2024 07:56:35 %S A373754 1,1,3,31,623,20641,1019051,70148989,6421463423,754405836811, %T A373754 110644077164479,19814920352425441,4255291684449288503, %U A373754 1079391696218976473971,319292229636452654327115,108942069149956119095870401,42469095372194594340983910271,18758916770545140042717283889713 %N A373754 a(n) = A205497(2*n, n - 1). The central coefficients of the Eulerian zig-zag polynomials. %H A373754 T. Kyle Petersen and Yan Zhuang, <a href="https://arxiv.org/abs/2403.07181">Zig-zag Eulerian polynomials</a>, arXiv:2403.07181 [math.CO], 2024. %p A373754 1, 1, seq(A205497row(2*n)[n], n = 2..17); %Y A373754 Cf. A205497, A373755. %K A373754 nonn %O A373754 0,3 %A A373754 _Peter Luschny_, Jun 16 2024