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 A081740 #13 Feb 04 2016 11:25:30 %S A081740 1,1,11,176,3696,95986,2967041,106296586,4328071506,197304236151, %T A081740 9951699489061,550054365477936,33053174868315877,2144972900520659506, %U A081740 149472637758381213628,11130201727845695463914,881841184375010602801553,74061565980075915066583527 %N A081740 11-level labeled rooted trees with n leaves. %D A081740 J. Ginsburg, Iterated exponentials, Scripta Math., 11 (1945), 340-353. %D A081740 T. Hogg and B. A. Huberman, Attractors on finite sets: the dissipative dynamics of computing structures, Phys. Review A 32 (1985), 2338-2346. %H A081740 Alois P. Heinz, <a href="/A081740/b081740.txt">Table of n, a(n) for n = 0..360</a> %F A081740 E.g.f.: exp(exp(exp(exp(exp(exp(exp(exp(exp(exp(exp(x)-1)-1)-1)-1)-1) -1) -1) -1) -1) -1). %o A081740 (PARI) a(n)=local(X); if(n<0,0,X=x+x*O(x^n); n!*polcoeff (exp( exp( exp( exp( exp( exp(exp(exp(exp(exp(exp(X)-1)-1)-1)-1)-1)-1)-1)-1)-1)-1), n)) %Y A081740 Cf. A000110, A000258, A000307, A000357, A001669. %Y A081740 Column k=10 of A144150. %K A081740 nonn %O A081740 0,3 %A A081740 _Benoit Cloitre_, Apr 23 2003