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 | 189 |
| 3 | 1620 |
| 4 | 9861 |
| 5 | 171851 |
| 6 | 2063378 |
| 7 | 20599895 |
| 8 | 248421807 |
| 9 | 2936448567 |
| 10 | 33036817382 |
| 11 | 380933664485 |
| 12 | 4411216117906 |
| 13 | 50689193709680 |
| 14 | 583360678744857 |
| 15 | 6721605421544199 |
| 16 | 77399781711154720 |
| 17 | 891207805003409728 |