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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 267 |
| 4 | 3771 |
| 5 | 64188 |
| 6 | 1273599 |
| 7 | 28784997 |
| 8 | 728619516 |
| 9 | 20389690953 |
| 10 | 624380711769 |
| 11 | 20749726230192 |
| 12 | 743217114278241 |
| 13 | 28526465892902643 |
| 14 | 1167521852585583504 |
| 15 | 50735768950040355747 |
| 16 | 2332267950561718237011 |
| 17 | 113040281313704744222148 |
| 18 | 5759890462485002871029439 |