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 A027235 #10 Jun 19 2025 23:00:58
%S A027235 1,3,8,22,53,138,317,803,1794,4478,9823,24321,52662,129815,278365,
%T A027235 684689,1457113,3581074,7574863,18616678,39182980,96351078,201947877,
%U A027235 497006898,1038017513,2557192089,5324505911,13131212951,27268815916
%N A027235 a(n) = Sum_{k=0..n} (k+1) * A026758(n, k).
%Y A027235 Cf. A026758.
%K A027235 nonn
%O A027235 0,2
%A A027235 _Clark Kimberling_