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 A124818 #2 Mar 30 2012 18:59:18 %S A124818 1,1,1,3,4,12,19,56,97,284,519,1516,2871,8380,16281,47517,94117, %T A124818 274733,552458,1613119,3283615,9590965,19720434,57620008,119480043, %U A124818 349217316,729363169,2132461957,4481537753,13106711534 %N A124818 Row sums of number triangle A124816. %K A124818 nonn %O A124818 0,4 %A A124818 _Paul Barry_, Nov 08 2006