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 A061136 #8 Jul 02 2019 02:56:36 %S A061136 0,0,1,3,12,40,120,336,2128,13392,118800,850960,6004416,38408448, %T A061136 260321152,1744135680,17067141120,167200393216,1838196972288, %U A061136 18345298804992,181218866222080,1673804042803200,16992835499329536 %N A061136 Number of degree-n odd permutations of order dividing 4. %H A061136 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 A061136 E.g.f.: 1/2*exp(x + 1/2*x^2 + 1/4*x^4) - 1/2*exp(x - 1/2*x^2 - 1/4*x^4). %Y A061136 Cf. A000085, A001470, A001472, A052501, A053496 - A053505, A001189, A001471, A001473, A061121 - A061128, A000704, A061129 - A061132, A048099, A051695, A061133 - A061135, A001465, A061136 - A061140. %K A061136 easy,nonn %O A061136 0,4 %A A061136 _Vladeta Jovovic_, Apr 14 2001