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 A047882 #7 May 24 2021 00:34:35 %S A047882 0,5,10,19,31,50,75,110,151,205,268,346,434,540,658,797,949,1124,1315, %T A047882 1532,1765,2027,2308,2620,2952,3318,3706,4131,4579,5066,5579,6134, %U A047882 6715,7341,7996,8698,9430,10212,11026,11893,12793,13748 %N A047882 a(n) = A047881(n) / 2. %K A047882 nonn %O A047882 0,2 %A A047882 _Clark Kimberling_ %E A047882 Name corrected by _Sean A. Irvine_, May 23 2021