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 | 55 |
| 3 | 99 |
| 4 | 215 |
| 5 | 357 |
| 6 | 663 |
| 7 | 3725 |
| 8 | 6321 |
| 9 | 26999 |
| 10 | 191363 |
| 11 | 675861 |
| 12 | 4073533 |
| 13 | 4180943 |
| 14 | 5540147 |
| 15 | 6531789 |
| 16 | 400974175 |
| 17 | 4248550291 |
| 18 | 6224149881 |
| 19 | 17109266357 |
| 20 | 38023877981 |
| 21 | 55995454633 |
| 22 | 62836534343 |
| 23 | 212955815417 |