I used this part of the Wikipedia article about Pascal's triangle as a starting point, but others' far-more-elegant solutions used very different methods. I'd also be interested in more resources about this.

The initial Clojure code is misleading - we don't want a function websites, we want a vector. Yet if I'm not mistaken we start off with (defn websites []). Am I missing something?

I'm seeing HTML-escaped > symbols in kata previews in Chrome. See screenshot - when I click on the kata, those sequences correctly render as =>.

I have mixed feelings about that. Most kata would be dull if we could see the test cases ahead of time. But for this one I found it frustrating to write a perfectly valid number adder only to fail because the author wanted a number adder that works on numbers with leading zeroes. Eh.

Aw yeah.