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) |
|---|---|
| 2 | 1 |
| 3 | 7 |
| 4 | 34 |
| 5 | 184 |
| 6 | 785 |
| 7 | 4107 |
| 8 | 16894 |
| 9 | 88397 |
| 10 | 358212 |
| 11 | 1892182 |
| 12 | 7609892 |
| 13 | 40695540 |
| 14 | 162938176 |
| 15 | 882569071 |
| 16 | 3523144085 |
| 17 | 19320028921 |
| 18 | 76956041950 |
| 19 | 426863069443 |
| 20 | 1697410759579 |
| 21 | 9513773568608 |
| 22 | 37779519792187 |
| 23 | 213739273560729 |
| 24 | 847809431322520 |
| 25 | 4836704323382544 |
| 26 | 19167125562029304 |