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 | 3 |
| 3 | 11 |
| 4 | 25 |
| 5 | 137 |
| 6 | 49 |
| 7 | 363 |
| 8 | 761 |
| 9 | 7129 |
| 10 | 80939 |
| 11 | 83249 |
| 12 | 1109957 |
| 13 | 1135697 |
| 14 | 1159721 |
| 15 | 2364487 |
| 16 | 40916999 |
| 17 | 13865893 |
| 18 | 267536047 |
| 19 | 271415923 |
| 20 | 274943083 |
| 21 | 6401288429 |
| 22 | 6475652719 |
| 23 | 32735212187 |
| 24 | 33078431987 |
| 25 | 300680459483 |
| 26 | 43364113769 |
| 27 | 1269032646901 |
| 28 | 1280123549581 |
| 29 | 40016557117411 |
| 30 | 3666283538201 |