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 | 26 |
| 4 | 205 |
| 5 | 1936 |
| 6 | 22265 |
| 7 | 297296 |
| 8 | 4544185 |
| 9 | 78098176 |
| 10 | 1491632525 |
| 11 | 31336418816 |
| 12 | 718181418565 |
| 13 | 17831101321216 |
| 14 | 476768795646785 |
| 15 | 13658417358350336 |
| 16 | 417370516232719345 |
| 17 | 13551022195053101056 |