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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 19 |
| 7 | 48 |
| 8 | 111 |
| 9 | 4630 |
| 10 | 5428 |
| 11 | 13569 |
| 12 | 41628 |
| 13 | 87659 |
| 14 | 108990 |
| 15 | 555716 |
| 16 | 751863 |
| 17 | 973813 |
| 18 | 5124585 |
| 19 | 8663699 |
| 20 | 19545678 |
| 21 | 24330343 |