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 A061140 #4 May 10 2013 12:44:45 %S A061140 0,0,0,0,0,0,0,0,5040,45360,226800,831600,9979200,103783680, %T A061140 2058376320,23870246400,265686220800,2477893017600,47031546481920, %U A061140 656384611034880,11972743148620800,165640695384729600,1969108505560627200 %N A061140 Number of degree-n odd permutations of order exactly 8. %F A061140 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) + 1/2*exp(x + 1/2*x^2 + 1/4*x^4 + 1/8*x^8) - 1/2*exp(x - 1/2*x^2 - 1/4*x^4 - 1/8*x^8). %Y A061140 Cf. A000085, A001470, A001472, A052501, A053496 - A053505, A001189, A001471, A001473, A061121 - A061128, A000704, A061129 - A061132, A048099, A051695, A061133 - A061135. %K A061140 easy,nonn %O A061140 0,9 %A A061140 _Vladeta Jovovic_, Apr 14 2001