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 A144526 #3 Mar 30 2012 16:51:00 %S A144526 1,2,4,16,128,640,5120,71680,573440,2293760,6553600,504627200, %T A144526 1153433600,209924915200,2938948812800,58778976256000, %U A144526 1880927240192000,415269650432000,255806104666112000,15260018802688000,194412639546245120000,418734915945758720000 %N A144526 Denominators of expansion of exp(1-sqrt(1-3*x)). %e A144526 1 + (3/2)*x + (9/4)*x^2 + (63/16)*x^3 + (999/128)*x^4 + (10773/640)*x^5 + (196911/5120)*x^6 + ... %Y A144526 Cf. A144525, A001511, A143991/A143968. %K A144526 nonn,frac %O A144526 0,2 %A A144526 _N. J. A. Sloane_, Dec 20 2008