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Masao Koike, Modular forms on non-compact arithmetic triangle groups, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021.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 29.
Sequence in context: A136359 A257649 A259240 * A084006 A254648 A202330
Adjacent sequences: A341552 A341553 A341554 * A341556 A341557 A341558
Robert C. Lyons, Feb 14 2021