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Oct 16 at 17:24 comment added David Farmer For A002408, as mentioned in the previous comments, it is not accurate to refer to the source of that sequence as an "8-dimensional cusp form." For one thing is is not a cusp form. For another, the term "dimension" is archaic. These days the term "weight" is standard (and weight is half of what was called dimension).
Oct 2 at 8:35 comment added Aurel To add to @Kimball's comment, these are clearly coefficients of Eisenstein series.
Oct 1 at 23:56 comment added Kimball There are no weight 4/2 cusp forms for those groups.
Oct 1 at 22:53 history asked Madhusudhan Raman CC BY-SA 4.0