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 | 9 |
| 3 | 131 |
| 4 | 209 |
| 5 | 3051 |
| 6 | 44539 |
| 7 | 71059 |
| 8 | 1037331 |
| 9 | 15143129 |
| 10 | 24159851 |
| 11 | 352689489 |
| 12 | 5148619321 |
| 13 | 8214278281 |
| 14 | 119913388929 |
| 15 | 1750515426011 |
| 16 | 2792830455689 |
| 17 | 40770199546371 |
| 18 | 595170096224419 |
| 19 | 949554140655979 |
| 20 | 13861747932377211 |
| 21 | 202356082200876449 |
| 22 | 322845614992577171 |