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 A316331 #22 Jul 11 2018 10:36:31 %S A316331 1,13,655,71063,13237457,3748521653,1495006933759,796798642614895, %T A316331 546144645571635169,467512355698028529821,488384275088035513080239, %U A316331 611057820865315450415912327,901643505614430586911510015025,1548711768835068239482321088560837 %N A316331 a(n) = A000085(4*n+1)/2^n. %H A316331 Seiichi Manyama, <a href="/A316331/b316331.txt">Table of n, a(n) for n = 0..210</a> %H A316331 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 A316331 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 A316331 Cf. A000085, A316330, A316332, A316333. %K A316331 nonn %O A316331 0,2 %A A316331 _N. J. A. Sloane_, Jul 09 2018, following a suggestion from _Doron Zeilberger_