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 A111783 #3 Oct 12 2012 14:40:23 %S A111783 1,90,5005,223740,8886735,329819490,11775438675,411859047600, %T A111783 14282642924550,495142102154700,17259324931198350,607418587742967000, %U A111783 21648370208790575250,783042495355599979500,28791389550204705674250 %N A111783 Tenth column (m=9) of unsigned triangle A111595. %F A111783 E.g.f. (1/sqrt(1-x^2))*((x/(1-x))^9)/9!. %F A111783 a(n)=(n!/9!)*sum(binomial(2*k, k)*binomial(n-2*k-1, 8)/(4^k), k=0..floor((n-9)/2)), n>=9. %K A111783 nonn,easy %O A111783 9,2 %A A111783 _Wolfdieter Lang_, Aug 23 2005