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 | 2 |
| 2 | 175 |
| 3 | 2904 |
| 4 | 23522 |
| 5 | 126888 |
| 6 | 521475 |
| 7 | 1765382 |
| 8 | 5153295 |
| 9 | 13412318 |
| 10 | 31816983 |
| 11 | 69951724 |
| 12 | 144272314 |
| 13 | 281895828 |
| 14 | 525712348 |
| 15 | 941516596 |
| 16 | 1627256650 |
| 17 | 2725454906 |
| 18 | 4438574843 |
| 19 | 7049265930 |
| 20 | 10944500376 |
| 21 | 16646835858 |
| 22 | 24851001712 |
| 23 | 36469592898 |