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 A027253 #9 Oct 26 2019 15:42:26 %S A027253 1,2,11,43,220,984,5110,24200,127649,626505,3345863,16847161,90863911, %T A027253 466507567,2536185547,13221761945,72350925134,381847149426, %U A027253 2100852968144,11199635371558,61899477831260,332745848952712,1846197664841460,9994041629456490,55635847260490940 %N A027253 Sum of squares of numbers in row n of array T given by A026780. %K A027253 nonn %O A027253 0,2 %A A027253 _Clark Kimberling_ %E A027253 More terms from _Sean A. Irvine_, Oct 26 2019