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 A075744 #12 Feb 24 2019 10:59:19 %S A075744 1,1,5,36,338,3898,53173,835992,14864340,294606273,6434871231, %T A075744 153473830678,3966604562709,110386840008838,3289768253831145, %U A075744 104502173165838799,3523895395660532937,125689588963370029163,4726867751402704638366,186902021178952943036080 %N A075744 Hierarchies of hierarchies. %C A075744 Stirling transform of A084357 = number of sets of sets of lists. - _Thomas Wieder_, Jun 19 2005 %H A075744 T. D. Noe, <a href="/A075744/b075744.txt">Table of n, a(n) for n=0..100</a> %F A075744 E.g.f.: exp(f(x)-1) where f(x) = e.g.f. for A075729. %t A075744 m = 20; %t A075744 f[x_] = Exp[1/(2 - Exp[x]) - 1]; %t A075744 CoefficientList[Exp[f[x] - 1] + O[x]^m, x]*Range[0, m - 1]! (* _Jean-François Alcover_, Feb 24 2019 *) %Y A075744 Cf. A075729, A075756. %Y A075744 Cf. A084357. %K A075744 nonn %O A075744 0,3 %A A075744 _N. J. A. Sloane_, Oct 15 2002