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 A061128 #4 May 10 2013 12:44:45 %S A061128 0,0,0,0,0,0,0,0,0,120960,2661120,27941760,536215680,6901614720, %T A061128 90084234240,1540714855680,33110649411840,554845922991360, %U A061128 8393918663370240,141081442901118720,2869353360741853440 %N A061128 Number of degree-n permutations of order exactly 30. %F A061128 E.g.f.: - exp(x) + exp(x + 1/2*x^2) + exp(x + 1/3*x^3) + exp(x + 1/5*x^5) - exp(x + 1/2*x^2 + 1/3*x^3 + 1/6*x^6) - exp(x + 1/2*x^2 + 1/5*x^5 + 1/10*x^10) - exp(x + 1/3*x^3 + 1/5*x^5 + 1/15*x^15) + exp(x + 1/2*x^2 + 1/3*x^3 + 1/5*x^5 + 1/6*x^6 + 1/10*x^10 + 1/15*x^15 + 1/30*x^30). %Y A061128 Cf. A000085, A001470, A001472, A052501, A053496 - A053505, A001189, A001471, A001473, A061121 - A061128. %K A061128 easy,nonn %O A061128 1,10 %A A061128 _Vladeta Jovovic_, Apr 14 2001