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 A341562 #10 Mar 31 2023 08:13:56
%S A341562 0,1,12,-801,-27248,-389730,-3120012,-14532448,-35492160,-19420479,
%T A341562 117458280,405309252,1029595248,887517566,-3584009856,-3351877470,
%U A341562 -1982054144,-34455379518,33499242252,58483431740,-28952389920,113929105248,227377787184,-603011632584,182257162560
%N A341562 Fourier coefficients of the modular form (1/t_{3A}) * sqrt(1 - 108/t_{3A}) * F_{3A}^18.
%H A341562 Masao Koike, <a href="/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, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021. Sloane wrote 2005 on the first page but the internal evidence suggests 1997.] See page 30.
%F A341562 1/t_{3A} is A030197, F_{3A} is A004016. - _Georg Fischer_, Mar 31 2023
%Y A341562 Cf. A004016, A030197, A341555, A341560.
%K A341562 sign
%O A341562 0,3
%A A341562 _Robert C. Lyons_, Feb 14 2021
%E A341562 More terms from _Georg Fischer_, Mar 31 2023