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 A186022 #4 Mar 30 2012 18:59:28 %S A186022 1,1,3,6,19,62,239,1013,4723,23870,129779,753784,4651285,30349577, %T A186022 208575027,1504582526,11358446495,89501837358,734420232291, %U A186022 6262593615501,55392254339667,507335283474158,4804245661175599,46971060027956608,473534995965134505,4916730522706507665 %N A186022 Diagonal sums of number triangle A186020. %K A186022 nonn %O A186022 0,3 %A A186022 _Paul Barry_, Feb 10 2011