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 A027244 #11 Oct 27 2019 11:35:07
%S A027244 1,3,8,23,59,158,395,1023,2522,6414,15694,39486,96226,240470,584762,
%T A027244 1454777,3533743,8763720,21276031,52642872,127770797,315574532,
%U A027244 765852193,1888788990,4583560631,11290381790,27397549743,67414670138
%N A027244 a(n) = Sum_{k=0..n} (k+1) * A026769(n, n-k).
%K A027244 nonn
%O A027244 0,2
%A A027244 _Clark Kimberling_