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 | 17 |
| 10 | 181 |
| 11 | 1361 |
| 12 | 8107 |
| 13 | 40187 |
| 14 | 172207 |
| 15 | 653921 |
| 16 | 2243296 |
| 17 | 7053912 |
| 18 | 20568960 |
| 19 | 56141388 |
| 20 | 144540144 |
| 21 | 353269224 |
| 22 | 824102928 |
| 23 | 1843357923 |
| 24 | 3969216603 |
| 25 | 8255612079 |
| 26 | 16635486439 |
| 27 | 32560881353 |
| 28 | 62048339353 |
| 29 | 115351334813 |