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 A049741 #4 Mar 30 2012 18:56:56 %S A049741 5,21,45,81,137,193,277,357,457,577,697,845,981,1153,1321,1505,1725, %T A049741 1933,2161,2393,2629,2917,3181,3489,3769,4093,4421,4741,5129,5465, %U A049741 5853,6237,6621,7049,7473,7917,8389,8841,9329,9785 %N A049741 a(n)=T(n,n+1), array T as in A049735. %K A049741 nonn %O A049741 0,1 %A A049741 _Clark Kimberling_