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 | 15 |
| 2 | 36 |
| 3 | 99 |
| 4 | 292 |
| 5 | 876 |
| 6 | 2628 |
| 7 | 7884 |
| 8 | 23652 |
| 9 | 70956 |
| 10 | 212868 |
| 11 | 638604 |
| 12 | 1915812 |
| 13 | 5747436 |
| 14 | 17242308 |
| 15 | 51726924 |
| 16 | 155180772 |
| 17 | 465542316 |
| 18 | 1396626948 |
| 19 | 4189880844 |
| 20 | 12569642532 |
| 21 | 37708927596 |
| 22 | 113126782788 |
| 23 | 339380348364 |
| 24 | 1018141045092 |
| 25 | 3054423135276 |
| 26 | 9163269405828 |
| 27 | 27489808217484 |