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 A339015 #7 Nov 20 2020 17:10:33 %S A339015 1,1,2,9,111,6080,2331767,7236956181,245064356389568, %T A339015 78469113627976220371,385877971701656172196852819, %U A339015 19697040027380132150099537371545994,21113166239259522704639849969501602121765293,249833571924973472096067102574812255987693440940863465 %N A339015 Column sums of A339016. %Y A339015 Cf. A339016. %K A339015 nonn %O A339015 0,3 %A A339015 _Peter Luschny_, Nov 20 2020