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 A341554 #15 Mar 31 2023 06:48:49
%S A341554 1,6,-810,-22134,-278634,-2122524,-11039814,-43693008,-145572714,
%T A341554 -424326378,-1083745980,-2551211640,-5663429382,-11474793708,
%U A341554 -22397094864,-42109347204,-74498070378,-128307428244,-217704941082,-349133308872,-555058873404,-870035772336,-1308777310008
%N A341554 Fourier coefficients of the modular form sqrt(1 - 108/t_{3A}) * F_{3A}^10.
%H A341554 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, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021.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 29.
%F A341554 1/t_{3A} is A030197, F_{3A} is A004016. - _Georg Fischer_, Mar 31 2023
%Y A341554 Cf. A004016, A030197, A341305, A341555, A341559.
%K A341554 sign
%O A341554 0,2
%A A341554 _Robert C. Lyons_, Feb 14 2021
%E A341554 More terms from _Georg Fischer_, Mar 31 2023