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 A061130 #10 Jul 02 2019 02:56:03 %S A061130 1,1,1,3,12,36,126,666,6588,44892,237996,2204676,26370576,219140208, %T A061130 1720782792,19941776856,234038005776,2243409386256,23225205107088, %U A061130 295070141019312,4303459657780416,55200265166477376,660776587455193056 %N A061130 Number of degree-n even permutations of order dividing 6. %H A061130 Alois P. Heinz, <a href="/A061130/b061130.txt">Table of n, a(n) for n = 0..522</a> %H A061130 Lev Glebsky, Melany Licón, Luis Manuel Rivera, <a href="https://arxiv.org/abs/1907.00548">On the number of even roots of permutations</a>, arXiv:1907.00548 [math.CO], 2019. %F A061130 E.g.f.: 1/2*exp(x + 1/2*x^2 + 1/3*x^3 + 1/6*x^6) + 1/2*exp(x - 1/2*x^2 + 1/3*x^3 - 1/6*x^6). %Y A061130 Cf. A000085, A001470, A001472, A052501, A053496 - A053505, A001189, A001471, A001473, A061121 - A061128, A000704, A061129 - A061132, A048099, A051695, A061133 - A061135. %K A061130 easy,nonn %O A061130 0,4 %A A061130 _Vladeta Jovovic_, Apr 14 2001