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 A166020 #2 Mar 31 2012 13:21:19 %S A166020 1,6,22,63,139,277,481,785,1256,1851,2688,3692,5055,6731,8797,11239, %T A166020 14175,17834,21947,26701,32181,38769,46002,54364,63742,74455,86182, %U A166020 99345,114094,130213,148293,167991,189584,212705,238497,266350,297058 %N A166020 Row sums of triangular table A138612. %K A166020 nonn %O A166020 1,2 %A A166020 _Antti Karttunen_, Oct 05 2009