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 A198948 #6 Feb 14 2021 01:35:16 %S A198948 1,-56,-2296,-13664,-73976,-175056,-560224,-941248,-2367736,-3320408, %T A198948 -7177296,-9018912,-18050144,-20792464,-38591168,-42713664,-75768056, %U A198948 -79512048,-136136728,-138661600,-231248976,-229664512,-369775392,-360435264,-577727584,-547050056,-852491024,-806859200,-1243388608,-1148624400,-1751260224,-1603232512 %N A198948 Expansion of modular form (E6(q)+8*E6(q^2))/9, where E6 = A013973. %H A198948 Masao Koike, <a href="https://oeis.org/A004016/a004016.pdf">Modular forms on non-compact arithmetic triangle groups</a>, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021. I wrote 2005 on the first page but the internal evidence suggests 1997.] %K A198948 sign %O A198948 0,2 %A A198948 _N. J. A. Sloane_, Oct 31 2011