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 A373755 #8 Jun 17 2024 07:56:39 %S A373755 1,1,1,1,3,7,31,109,623,2951,20641,123216,1019051,7349140,70148989, %T A373755 593513485,6421463423,62382094567,754405836811,8277393686747, %U A373755 110644077164479,1353422057172923,19814920352425441,267391099520321166,4255291684449288503,62800765220575811118 %N A373755 a(n) = A205497(n, floor((n - 1) / 2)). The middle coefficients of the Eulerian zig-zag polynomials. %H A373755 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 A373755 1, 1, 1, seq(A205497row(n)[iquo(n, 2)], n = 3..25); %Y A373755 Cf. A205497, A373754. %K A373755 nonn %O A373755 0,5 %A A373755 _Peter Luschny_, Jun 16 2024