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 | 9 |
| 5 | 18 |
| 6 | 21 |
| 7 | 43 |
| 8 | 59 |
| 9 | 74 |
| 10 | 557 |
| 11 | 8292 |
| 12 | 31898 |
| 13 | 68595 |
| 14 | 530152 |
| 15 | 599960 |
| 16 | 724192 |
| 17 | 1373197 |
| 18 | 1452846 |
| 19 | 5125588 |
| 20 | 5776688 |