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 A134589 #12 Jun 03 2019 12:28:32 %S A134589 1,3,12,49,108,243,624,1681,5616,47628,49300,27361200,29949750, %T A134589 920048500,1054364310,1278524208,9992125972 %N A134589 A modified Heron sequence starting from 1,3. %H A134589 Paul Yiu, K. R. S. Sastry and Shanzhen Gao, <a href="http://www.westga.edu/~integers/j16proc/j16proc.pdf">Heron Sequences</a>, presented on the 2007 Integers Conference and INTEGERS - Electronic Journal of Combinatorial Number Theory, Article 16 Volume 9 Supplement (2009). %Y A134589 Cf. A134587, A134588. %K A134589 nonn,more %O A134589 1,2 %A A134589 _Shanzhen Gao_, Nov 02 2007 %E A134589 a(8)-a(17) from _Rémy Sigrist_, Jun 03 2019