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 | 2 |
| 3 | 4 |
| 4 | 76 |
| 5 | 418 |
| 6 | 1102 |
| 7 | 4687 |
| 8 | 7637 |
| 9 | 139183 |
| 10 | 2543923 |
| 11 | 1614895738 |
| 12 | 9083990938 |
| 13 | 23149317409 |
| 14 | 497240757797 |
| 15 | 4447730232523 |
| 16 | 16000967516764 |
| 17 | 65262766108619 |
| 18 | 141644055557882 |