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 | 5 |
| 3 | 27 |
| 4 | 154 |
| 5 | 744 |
| 6 | 3226 |
| 7 | 12688 |
| 8 | 46037 |
| 9 | 155645 |
| 10 | 495251 |
| 11 | 1493647 |
| 12 | 4296714 |
| 13 | 11848026 |
| 14 | 31451899 |
| 15 | 80666519 |
| 16 | 200509690 |
| 17 | 484315994 |
| 18 | 1139426161 |
| 19 | 2616322539 |
| 20 | 5873891912 |
| 21 | 12914638982 |
| 22 | 27846986092 |
| 23 | 58961254653 |
| 24 | 122728579066 |
| 25 | 251399638554 |