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 | 5 |
| 3 | 39 |
| 4 | 357 |
| 5 | 3471 |
| 6 | 35003 |
| 7 | 362265 |
| 8 | 3821877 |
| 9 | 40918431 |
| 10 | 443234475 |
| 11 | 4847042025 |
| 12 | 53425329675 |
| 13 | 592800026625 |
| 14 | 6615155585925 |
| 15 | 74183656771239 |
| 16 | 835491101084757 |
| 17 | 9445356930180735 |
| 18 | 107140324945955483 |
| 19 | 1218962144543118009 |