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 A201078 #9 May 29 2018 14:51:48 %S A201078 2,4,12,24,50,92,172,296,510,840,1372,2176,3424,5268,8040,12072,17976, %T A201078 26428,38564,55680,79846,113500,160320,224768,313320,433916,597788, %U A201078 818840,1116238,1513900,2044180,2747520,3677864,4902732,6510960,8613840,11356208 %N A201078 Twice A137829. %H A201078 Brian Drake, <a href="http://dx.doi.org/10.1016/j.disc.2008.11.020">Limits of areas under lattice paths</a>, Discrete Math. 309 (2009), no. 12, 3936-3953. See Corollary 7. %K A201078 nonn %O A201078 0,1 %A A201078 _N. J. A. Sloane_, Nov 26 2011