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) |
|---|---|
| 3 | 11 |
| 4 | 33 |
| 5 | 102 |
| 6 | 344 |
| 7 | 1241 |
| 8 | 4719 |
| 9 | 18785 |
| 10 | 77917 |
| 11 | 335502 |
| 12 | 1495094 |
| 13 | 6877587 |
| 14 | 32587137 |
| 15 | 158736257 |
| 16 | 793609535 |
| 17 | 4066342542 |
| 18 | 21325689560 |
| 19 | 114340142239 |
| 20 | 626087871897 |
| 21 | 3497839239743 |
| 22 | 19921238359695 |
| 23 | 115568831686398 |
| 24 | 682428323156306 |
| 25 | 4098963089083577 |
| 26 | 25027772430177051 |