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 A047763 #6 Jun 26 2022 23:17:23 %S A047763 0,0,1,6,32,176,952,5302,29960,172536,1007575,5959656,35622384, %T A047763 214875104,1306303424,7995896502,49236826080,304799714960, %U A047763 1895785216039,11841367945110,74245791718824,467136323951040,2948374926743584 %N A047763 a(n) = A047762(2n+1). %K A047763 nonn %O A047763 0,4 %A A047763 _N. J. A. Sloane_