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 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 233 |
| 5 | 2329 |
| 6 | 27949 |
| 7 | 391285 |
| 8 | 6260561 |
| 9 | 112690097 |
| 10 | 2253801941 |
| 11 | 49583642701 |
| 12 | 1190007424825 |
| 13 | 30940193045449 |
| 14 | 866325405272573 |
| 15 | 25989762158177189 |
| 16 | 831672389061670049 |
| 17 | 28276861228096781665 |
| 18 | 1017967004211484139941 |
| 19 | 38682746160036397317757 |