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 A049740 #4 Mar 30 2012 18:56:56 %S A049740 1,9,25,61,101,161,225,305,405,509,633,761,889,1069,1229,1425,1609, %T A049740 1813,2029,2253,2521,2769,3045,3317,3597,3937,4249,4581,4925,5273, %U A049740 5649,6025,6437,6845,7265,7705,8113,8597,9061,9569 %N A049740 a(n)=T(n,n), array T as in A049735. %K A049740 nonn %O A049740 0,2 %A A049740 _Clark Kimberling_