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 A284863 #6 Apr 11 2017 11:47:57 %S A284863 1,3,27,27,405,729,5103,2187,295245,98415,649539,531441,241805655, %T A284863 55801305,71744535,14348907,3658971285,1162261467,51526925037, %U A284863 1162261467,4027235983155,575319426165,3608821855035,1412147682405,642527195494275,77103263459313,480412641554181,53379182394909 %N A284863 Denominators of exponential expansion of (3/(2*log(1+x)))*(1 - 1/(1+x)^(2/3)). %C A284863 For the numerators see A284862, also for details. %C A284863 The z-sequence for the Sheffer triangle A225466 is 2*A284862(n)/a(n). %F A284863 a(n) = denominator(r(n)), with the rationals (in lowest terms) r(n) = [x^n/n!] (1/log((1+x)^(1/3)))*(1 - 1/(1+x)^(2/3)). %e A284863 See A284862. %Y A284863 Cf. A225466, A284862. %K A284863 nonn,easy %O A284863 0,2 %A A284863 _Wolfdieter Lang_, Apr 09 2017