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 A316333 #21 Jul 11 2018 10:36:14 %S A316333 1,29,2231,323423,75151585,25451905333,11799518538967, %T A316333 7161375112402823,5503252915369107329,5217568316626716585485, %U A316333 5977663757214838174587319,8136442760259565566724537711,12972630954295515566319694027489,23938932303527622015634131021262757 %N A316333 a(n) = A000085(4*n+3)/2^(n+2). %H A316333 Seiichi Manyama, <a href="/A316333/b316333.txt">Table of n, a(n) for n = 0..210</a> %H A316333 S. Chowla, I. N. Herstein and W. K. Moore, <a href="http://dx.doi.org/10.4153/CJM-1951-038-3">On recursions connected with symmetric groups I</a>, Canad. J. Math. 3 (1951) 328-334. %H A316333 Dongsu Kim and Jang Soo Kim, <a href="http://dx.doi.org/10.1016/j.jcta.2009.08.002">A combinatorial approach to the power of 2 in the number of involutions</a>, J. Comb. Theory Ser. A 117 (8) (2010): 1082-1094. %Y A316333 Cf. A000085, A316330, A316331, A316332. %K A316333 nonn %O A316333 0,2 %A A316333 _N. J. A. Sloane_, Jul 09 2018, following a suggestion from _Doron Zeilberger_