This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 119 |
| 4 | 32707 |
| 5 | 69038213 |
| 6 | 1309743837515 |
| 7 | 206848589180297555 |
| 8 | 281897548265847120670891 |
| 9 | 3287603007740009094151486257065 |
| 10 | 330891681467139744269091005122077348971 |