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) |
|---|---|
| 8 | 1 |
| 9 | 12 |
| 10 | 88 |
| 11 | 524 |
| 12 | 2786 |
| 13 | 13788 |
| 14 | 64998 |
| 15 | 296032 |
| 16 | 1314648 |
| 17 | 5728172 |
| 18 | 24595512 |
| 19 | 104399172 |
| 20 | 439084884 |
| 21 | 1833027048 |
| 22 | 7605691356 |
| 23 | 31398503248 |
| 24 | 129072844079 |
| 25 | 528688519536 |
| 26 | 2158900271080 |
| 27 | 8792641674684 |
| 28 | 35728408159781 |