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 | 6 |
| 3 | 29 |
| 4 | 108 |
| 5 | 393 |
| 6 | 1298 |
| 7 | 4271 |
| 8 | 13312 |
| 9 | 41469 |
| 10 | 125042 |
| 11 | 376747 |
| 12 | 1111144 |
| 13 | 3274475 |
| 14 | 9505054 |
| 15 | 27573041 |
| 16 | 79086964 |
| 17 | 226727667 |
| 18 | 644301026 |
| 19 | 1830188555 |
| 20 | 5162408200 |
| 21 | 14556754485 |
| 22 | 40811281170 |