Table of n, a(n) for n=0..5.
Masao Koike, Modular forms on non-compact arithmetic triangle groups, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021.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.
Sequence in context: A159543 A227689 A006859 * A107967 A115500 A214085
Adjacent sequences: A341554 A341555 A341556 * A341558 A341559 A341560
Robert C. Lyons, Feb 14 2021