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 A288868 #7 Jun 20 2017 17:32:47 %S A288868 1,1,3,4,30,12,84,4,15,10,22,3,455,105,1,48,510,36,2660,168,660,1320, %T A288868 184,720,27300,6552,216,16,3480,240,114576,176,5355,3570,126,6,959595, %U A288868 10374,630,840 %N A288868 Denominators of the z-sequence for the Sheffer matrix S2*P = A048993*A007318 = A049020. %C A288868 The numerators are in A288867 where details and examples are given. %F A288868 E.g.f. of r(n) = A288867(n)/a(n), n >= 0: (exp(x)-1)/(log(1+x)*exp(x)). %F A288868 a(n) = denominator(r(n)) (r(n) in lowest terms). %Y A288868 Cf. A288867. %K A288868 nonn,frac,easy %O A288868 0,3 %A A288868 _Wolfdieter Lang_, Jun 20 2017