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 | 0 |
| 2 | 5 |
| 3 | 3 |
| 4 | 25 |
| 5 | 25 |
| 6 | 131 |
| 7 | 175 |
| 8 | 705 |
| 9 | 1137 |
| 10 | 3875 |
| 11 | 7095 |
| 12 | 21649 |
| 13 | 43225 |
| 14 | 122435 |
| 15 | 259423 |
| 16 | 698625 |
| 17 | 1541985 |
| 18 | 4011971 |
| 19 | 9107175 |
| 20 | 23143825 |
| 21 | 53559817 |
| 22 | 133933475 |
| 23 | 314086735 |
| 24 | 776787009 |
| 25 | 1838300625 |
| 26 | 4512108515 |
| 27 | 10745077143 |
| 28 | 26237143825 |
| 29 | 62749602745 |