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 A335686 #15 May 19 2024 08:13:09 %S A335686 0,0,0,2,6,16,44,90,266,508,966,1824,3548,6094,11586,19254,37492, %T A335686 61876,103110,170932,286916,456554,759962,1190034,1887766,2937820, %U A335686 4608084,7004646,10938762,16372732,24851432,37014368,56368810,82688102,122855526,179808396,263406424 %N A335686 Number of even entries in the character table of the symmetric group S_n. %H A335686 Hugo Pfoertner, <a href="/A335686/b335686.txt">Table of n, a(n) for n = 0..76</a> %H A335686 Alexander R. Miller, <a href="https://www.mat.univie.ac.at/~miller/ARMillerEvenOddNote.pdf">On parity and characters of symmetric groups</a>, preprint. %H A335686 Alexander R. Miller, <a href="https://doi.org/10.1016/j.jcta.2018.11.001">On parity and characters of symmetric groups</a>, J. Combin. Theory Ser. A 162 (2019), 231-240. Gives terms for n <= 76. %Y A335686 Cf. A006907, A274691. %K A335686 nonn %O A335686 0,4 %A A335686 _N. J. A. Sloane_, Jul 07 2020