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 A061121 #7 May 10 2013 12:44:45
%S A061121 0,0,0,0,20,240,1470,10640,83160,584640,4496030,42658440,371762820,
%T A061121 3594871280,38650622010,396457108320,4330689250160,53963701424640,
%U A061121 641211774798510,8205894865096280,113786291585124060
%N A061121 Number of degree-n permutations of order exactly 6.
%F A061121 E.g.f.: exp(x)-exp(x+1/2*x^2)-exp(x+1/3*x^3)+exp(x+1/2*x^2+1/3*x^3+1/6*x^6).
%t A061121 nn=21;Range[0,nn]!CoefficientList[Series[(Exp[x^6/6]-1)Exp[x+x^2/2+x^3/3]+(Exp[x^2/2]-1)(Exp[x^3/3]-1)Exp[x],{x,0,nn}],x]//Rest (* _Geoffrey Critzer_, Feb 04 2013 *)
%Y A061121 Cf. A000085, A001470, A001472, A052501, A053496-A053505, A001189, A001471, A001473, A061121-A061128.
%K A061121 easy,nonn
%O A061121 1,5
%A A061121 _Vladeta Jovovic_, Apr 14 2001