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 | 9 |
| 2 | 69 |
| 3 | 323 |
| 4 | 2569 |
| 5 | 14940 |
| 6 | 99682 |
| 7 | 640562 |
| 8 | 4101278 |
| 9 | 26607999 |
| 10 | 170810312 |
| 11 | 1102871801 |
| 12 | 7104859427 |
| 13 | 45791052572 |
| 14 | 295185451556 |
| 15 | 1902301744507 |
| 16 | 12261796238309 |
| 17 | 79028574384941 |
| 18 | 509365351856610 |
| 19 | 3283017190154762 |
| 20 | 21159928491044181 |