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 A097307 #9 Jun 15 2019 09:32:30
%S A097307 1,1,3,3,6,8,13,15,26,31,46,56,81,95,140,160,221,261,351,406,548,626,
%T A097307 820,945,1221,1393,1788,2035,2566,2928,3656,4139,5146,5810,7148,8078,
%U A097307 9850,11086,13461,15116,18214,20441,24489,27400,32708,36516,43329,48345
%N A097307 Row sums of array A097306.
%F A097307 a(n) = Sum_{k=1..ceiling(n/2)} A097306(n,k).
%K A097307 nonn,easy
%O A097307 1,3
%A A097307 _Wolfdieter Lang_, Aug 13 2004