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 | 11 |
| 3 | 39 |
| 4 | 543 |
| 5 | 2391 |
| 6 | 9559 |
| 7 | 38231 |
| 8 | 152919 |
| 9 | 611671 |
| 10 | 2446679 |
| 11 | 9786711 |
| 12 | 39146839 |
| 13 | 156587351 |
| 14 | 626349399 |
| 15 | 2505397591 |
| 16 | 10021590359 |
| 17 | 40086361431 |
| 18 | 160345445719 |
| 19 | 641381782871 |
| 20 | 2565527131479 |
| 21 | 10262108525911 |
| 22 | 41048434103639 |
| 23 | 164193736414551 |
| 24 | 656774945658199 |
| 25 | 2627099782632791 |