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 A167750 #7 Jan 11 2015 02:02:17 %S A167750 1,1,2,4,9,20,45,102,231,524,1189,2699,6127,13910,31581,71702,162796, %T A167750 369622,839216,1905419,4326211,9822571,22301948,50636130,114968339, %U A167750 261033373,592671205,1345648489,3055268857,6936928864,15750162908 %N A167750 Row sums of triangle A167749. %C A167750 Hankel transform is A167752. %F A167750 G.f.: 1/(1-x/(1-x/(1-x^2/(1-x^3/(1-x^4/(1-...)))))) (continued fraction); %F A167750 G.f.: 1/(1-x*f(x)), f(x) the g.f. of A005169. %e A167750 G.f. = 1 + x + 2*x^2 + 4*x^3 + 9*x^4 + 20*x^5 + 45*x^6 + 102*x^7 + ... %K A167750 easy,nonn %O A167750 0,3 %A A167750 _Paul Barry_, Nov 10 2009