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 | 2 |
| 1 | 3 |
| 2 | 5 |
| 3 | 10 |
| 4 | 30 |
| 5 | 210 |
| 6 | 16353 |
| 7 | 490013148 |
| 8 | 1392195548889993358 |
| 9 | 789204635842035040527740846300252680 |