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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 29 |
| 3 | 103 |
| 4 | 341 |
| 5 | 1087 |
| 6 | 3389 |
| 7 | 10423 |
| 8 | 31781 |
| 9 | 96367 |
| 10 | 291149 |
| 11 | 877543 |
| 12 | 2640821 |
| 13 | 7938847 |
| 14 | 23849309 |
| 15 | 71613463 |
| 16 | 214971461 |
| 17 | 645176527 |
| 18 | 1936053869 |
| 19 | 5809210183 |
| 20 | 17429727701 |
| 21 | 52293377407 |
| 22 | 156888520829 |
| 23 | 470682339703 |
| 24 | 1412080573541 |
| 25 | 4236308829487 |
| 26 | 12709060706189 |