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 | 7 |
| 3 | 45 |
| 4 | 280 |
| 5 | 1712 |
| 6 | 10351 |
| 7 | 62082 |
| 8 | 370142 |
| 9 | 2196701 |
| 10 | 12988928 |
| 11 | 76572159 |
| 12 | 450277842 |
| 13 | 2642226994 |
| 14 | 15476427641 |
| 15 | 90508059371 |