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 | 19 |
| 3 | 663 |
| 4 | 6501 |
| 5 | 36729 |
| 6 | 149842 |
| 7 | 491274 |
| 8 | 1375206 |
| 9 | 3413982 |
| 10 | 7710813 |
| 11 | 16133689 |
| 12 | 31690659 |
| 13 | 59028879 |
| 14 | 105082068 |
| 15 | 179893252 |
| 16 | 297641916 |
| 17 | 477906924 |
| 18 | 747198807 |
| 19 | 1140797259 |
| 20 | 1704931921 |
| 21 | 2499346773 |
| 22 | 3600290694 |
| 23 | 5103978990 |
| 24 | 7130572930 |