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 A152766 #14 Dec 01 2019 07:15:46 %S A152766 1,1,7,21,66,143,715,2431,8398,29393,104006,371450,1337220,3231615, %T A152766 17678835,64822395,238819350,883631595,3282060210,12233133510, %U A152766 45741281820,171529806825,644952073662,2430973200726,9183676536076,34766775458002,131873975875180 %N A152766 Largest proper divisor of the Catalan number A000108(n). %H A152766 Amiram Eldar, <a href="/A152766/b152766.txt">Table of n, a(n) for n = 2..1669</a> %F A152766 a(n) = A032742(A000108(n)). - _Amiram Eldar_, Dec 01 2019 %t A152766 Divisors[CatalanNumber[#]][[-2]]&/@Range[2,40] (* _Harvey P. Dale_, Jun 13 2011 *) %Y A152766 Cf. A000108, A152761, A152762, A152763, A152764, A152765. %K A152766 nonn %O A152766 2,3 %A A152766 _Omar E. Pol_, Dec 15 2008 %E A152766 Edited and extended by _N. J. A. Sloane_, Dec 19 2008