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 A027298 #9 Oct 27 2019 11:14:23
%S A027298 1,3,8,20,43,101,208,472,958,2126,4288,9368,18835,40673,81632,174704,
%T A027298 350266,744290,1491232,3150424,6309246,13265138,26557408,55610960,
%U A027298 111311068,232279836,464856832,967155824,1935314563
%N A027298 a(n) = Sum_{k=0..m} (k+1) * A026022(n, k), where m=n for n=0,1 and m = floor((n+3)/2) for n >= 2.
%K A027298 nonn
%O A027298 0,2
%A A027298 _Clark Kimberling_