The "thread list" uses a table element, as does the SchemeBBS main page. Additionally, I find your statement quite puzzling for the following reason. The DOCTYPE on this page contains "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN".
How odd, I assumed he was using HTML 2.0: https://tools.ietf.org/html/rfc1866 my apologies. I'll go work on that pull request now.
The "frequently" bit makes me unsure about what you're asking but I did post the trig and zigzag fizzbuzzes there. Maybe the spiral should be a fizzbuzz as well.
ah, well honestly I just remember those two and maybe one or two more from awhile back with the same image as the zigzag. Anyway good luck on your project anon, I look forward to seeing it.