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 | 8 |
| 4 | 18 |
| 5 | 78 |
| 6 | 206 |
| 7 | 872 |
| 8 | 2226 |
| 9 | 10820 |
| 10 | 26558 |
| 11 | 129248 |
| 12 | 335886 |
| 13 | 1630174 |
| 14 | 3990978 |
| 15 | 21778450 |
| 16 | 48749804 |
| 17 | 274937594 |
| 18 | 650637382 |
| 19 | 3598954596 |
| 20 | 7610277626 |
| 21 | 49741540498 |
| 22 | 93757794966 |
| 23 | 639655810986 |
| 24 | 1233712869392 |
| 25 | 8530089042832 |